Java数组实例练习题整理

网友投稿 254 2023-01-01


Java数组实例练习题整理

初级

1.定义一个函数,获取某个数组中的最小值

package practise;

public class GetMin {

public static void getMin(int[]num){

int min = num[0];

for(int i=0;i

min=(num[i]

}

System.*out*.print(min);

}

public static void main(String[] args){

int []a=new int[]{8,6,4,2,5};

*getMin*(a);

}

}

2.定义一个数组,数组成员10个,找出数组中最大数连同下标一起输出

package practise;

public class GetmaxIndex {

public static void main(String[] args) {

int[] n = new int[]{1, 2, 3, 4, 5, 6, 0};

int max = n[0];

int index=0;

for (int i = 0; i < n.length;i++){

if(max

max=n[i];

index=i;

}

}

System.*out*.println(max);

System.*out*.println(index);

}

}

3.给定一个整型数组,数组成员10个,求该数组中第二大的数的下标

package practise;

import java.util.Arrays;

public class TheSecendmax3 {

public static void main(String[] args) {

int[] num = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

int[] arr1 = Arrays.*copyOf*(num, num.length);

Arrays.*sort*(num);

int[] num1 = Arrays.*copyOfRange*(num, 0, 9);

System.*out*.println(num1[num1.length-1]);

for (int i = 0; i < arr1.length-1; i++) {

if (arr1[i] == num1[num1.length-1]) {

System.*out*.println("第二大的数的下标为"+i);

}

}

}

}

4.B哥去参加青年歌手大奖赛,有10个评委打分,(去掉一个最高一个最低)求平均分?

package practise;

import java.util.Arrays;

public class AverageScore {

public static void main(String[] args){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

double[] NewNum=Arrays.*copyOfRange*(num,1,9);

double average=0;

double sum=0;

for(int I=0;i

sum=sum+NewNum[I];

}

average=sum/NewNum.length;

System.*out*.println(average);

}

}

5.利用选择排序对数据进行降序排序

package practise;

public class Select_Sort {

//原理:在一组数组里面定义一个最大数值的下标,让int[index]和其它数值挨个比较,选出最大的值int[i],

// 并把该最大值的下标i和我们原先设置的index进行置换,即index=i;

//并且把他们两个的位置进行互换,依次类推,直到完全排序好

public static void main(String[] args){

int[] num=new int[]{4,3,1,6,9,5};

*ChooseSort*(num);

}

public static void ChooseSort(int[] array){

for(int I=0;i

Int index=i;//定义当前下标为最小值下标

for(int j=I+1;j

if(array[j]

index =j;

}

}

int temp = array[index];//交换

array[index] = array[I];

array[I] = temp;

}

for (int e:array){

System.*out*.print(e+”\t”);

}

}

}

6.定义数组,存放5个学生的成绩【成绩值自己设定】,将成绩从大到小排序,获得成绩之和,平均成绩,最小成绩,最大成绩。

package practise;

import java.util.Arrays;

public class StudentScore {

public static void Sort(double[] num) {

Arrays.*sort*(num);

double sum=0.0;

for (int e=0;e

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

min=(num[i]

}

System.*out*.print(min);

}

public static void main(String[] args){

int []a=new int[]{8,6,4,2,5};

*getMin*(a);

}

}

2.定义一个数组,数组成员10个,找出数组中最大数连同下标一起输出

package practise;

public class GetmaxIndex {

public static void main(String[] args) {

int[] n = new int[]{1, 2, 3, 4, 5, 6, 0};

int max = n[0];

int index=0;

for (int i = 0; i < n.length;i++){

if(max

max=n[i];

index=i;

}

}

System.*out*.println(max);

System.*out*.println(index);

}

}

3.给定一个整型数组,数组成员10个,求该数组中第二大的数的下标

package practise;

import java.util.Arrays;

public class TheSecendmax3 {

public static void main(String[] args) {

int[] num = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

int[] arr1 = Arrays.*copyOf*(num, num.length);

Arrays.*sort*(num);

int[] num1 = Arrays.*copyOfRange*(num, 0, 9);

System.*out*.println(num1[num1.length-1]);

for (int i = 0; i < arr1.length-1; i++) {

if (arr1[i] == num1[num1.length-1]) {

System.*out*.println("第二大的数的下标为"+i);

}

}

}

}

4.B哥去参加青年歌手大奖赛,有10个评委打分,(去掉一个最高一个最低)求平均分?

package practise;

import java.util.Arrays;

public class AverageScore {

public static void main(String[] args){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

double[] NewNum=Arrays.*copyOfRange*(num,1,9);

double average=0;

double sum=0;

for(int I=0;i

sum=sum+NewNum[I];

}

average=sum/NewNum.length;

System.*out*.println(average);

}

}

5.利用选择排序对数据进行降序排序

package practise;

public class Select_Sort {

//原理:在一组数组里面定义一个最大数值的下标,让int[index]和其它数值挨个比较,选出最大的值int[i],

// 并把该最大值的下标i和我们原先设置的index进行置换,即index=i;

//并且把他们两个的位置进行互换,依次类推,直到完全排序好

public static void main(String[] args){

int[] num=new int[]{4,3,1,6,9,5};

*ChooseSort*(num);

}

public static void ChooseSort(int[] array){

for(int I=0;i

Int index=i;//定义当前下标为最小值下标

for(int j=I+1;j

if(array[j]

index =j;

}

}

int temp = array[index];//交换

array[index] = array[I];

array[I] = temp;

}

for (int e:array){

System.*out*.print(e+”\t”);

}

}

}

6.定义数组,存放5个学生的成绩【成绩值自己设定】,将成绩从大到小排序,获得成绩之和,平均成绩,最小成绩,最大成绩。

package practise;

import java.util.Arrays;

public class StudentScore {

public static void Sort(double[] num) {

Arrays.*sort*(num);

double sum=0.0;

for (int e=0;e

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

}

System.*out*.print(min);

}

public static void main(String[] args){

int []a=new int[]{8,6,4,2,5};

*getMin*(a);

}

}

2.定义一个数组,数组成员10个,找出数组中最大数连同下标一起输出

package practise;

public class GetmaxIndex {

public static void main(String[] args) {

int[] n = new int[]{1, 2, 3, 4, 5, 6, 0};

int max = n[0];

int index=0;

for (int i = 0; i < n.length;i++){

if(max

max=n[i];

index=i;

}

}

System.*out*.println(max);

System.*out*.println(index);

}

}

3.给定一个整型数组,数组成员10个,求该数组中第二大的数的下标

package practise;

import java.util.Arrays;

public class TheSecendmax3 {

public static void main(String[] args) {

int[] num = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

int[] arr1 = Arrays.*copyOf*(num, num.length);

Arrays.*sort*(num);

int[] num1 = Arrays.*copyOfRange*(num, 0, 9);

System.*out*.println(num1[num1.length-1]);

for (int i = 0; i < arr1.length-1; i++) {

if (arr1[i] == num1[num1.length-1]) {

System.*out*.println("第二大的数的下标为"+i);

}

}

}

}

4.B哥去参加青年歌手大奖赛,有10个评委打分,(去掉一个最高一个最低)求平均分?

package practise;

import java.util.Arrays;

public class AverageScore {

public static void main(String[] args){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

double[] NewNum=Arrays.*copyOfRange*(num,1,9);

double average=0;

double sum=0;

for(int I=0;i

sum=sum+NewNum[I];

}

average=sum/NewNum.length;

System.*out*.println(average);

}

}

5.利用选择排序对数据进行降序排序

package practise;

public class Select_Sort {

//原理:在一组数组里面定义一个最大数值的下标,让int[index]和其它数值挨个比较,选出最大的值int[i],

// 并把该最大值的下标i和我们原先设置的index进行置换,即index=i;

//并且把他们两个的位置进行互换,依次类推,直到完全排序好

public static void main(String[] args){

int[] num=new int[]{4,3,1,6,9,5};

*ChooseSort*(num);

}

public static void ChooseSort(int[] array){

for(int I=0;i

Int index=i;//定义当前下标为最小值下标

for(int j=I+1;j

if(array[j]

index =j;

}

}

int temp = array[index];//交换

array[index] = array[I];

array[I] = temp;

}

for (int e:array){

System.*out*.print(e+”\t”);

}

}

}

6.定义数组,存放5个学生的成绩【成绩值自己设定】,将成绩从大到小排序,获得成绩之和,平均成绩,最小成绩,最大成绩。

package practise;

import java.util.Arrays;

public class StudentScore {

public static void Sort(double[] num) {

Arrays.*sort*(num);

double sum=0.0;

for (int e=0;e

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

max=n[i];

index=i;

}

}

System.*out*.println(max);

System.*out*.println(index);

}

}

3.给定一个整型数组,数组成员10个,求该数组中第二大的数的下标

package practise;

import java.util.Arrays;

public class TheSecendmax3 {

public static void main(String[] args) {

int[] num = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

int[] arr1 = Arrays.*copyOf*(num, num.length);

Arrays.*sort*(num);

int[] num1 = Arrays.*copyOfRange*(num, 0, 9);

System.*out*.println(num1[num1.length-1]);

for (int i = 0; i < arr1.length-1; i++) {

if (arr1[i] == num1[num1.length-1]) {

System.*out*.println("第二大的数的下标为"+i);

}

}

}

}

4.B哥去参加青年歌手大奖赛,有10个评委打分,(去掉一个最高一个最低)求平均分?

package practise;

import java.util.Arrays;

public class AverageScore {

public static void main(String[] args){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

double[] NewNum=Arrays.*copyOfRange*(num,1,9);

double average=0;

double sum=0;

for(int I=0;i

sum=sum+NewNum[I];

}

average=sum/NewNum.length;

System.*out*.println(average);

}

}

5.利用选择排序对数据进行降序排序

package practise;

public class Select_Sort {

//原理:在一组数组里面定义一个最大数值的下标,让int[index]和其它数值挨个比较,选出最大的值int[i],

// 并把该最大值的下标i和我们原先设置的index进行置换,即index=i;

//并且把他们两个的位置进行互换,依次类推,直到完全排序好

public static void main(String[] args){

int[] num=new int[]{4,3,1,6,9,5};

*ChooseSort*(num);

}

public static void ChooseSort(int[] array){

for(int I=0;i

Int index=i;//定义当前下标为最小值下标

for(int j=I+1;j

if(array[j]

index =j;

}

}

int temp = array[index];//交换

array[index] = array[I];

array[I] = temp;

}

for (int e:array){

System.*out*.print(e+”\t”);

}

}

}

6.定义数组,存放5个学生的成绩【成绩值自己设定】,将成绩从大到小排序,获得成绩之和,平均成绩,最小成绩,最大成绩。

package practise;

import java.util.Arrays;

public class StudentScore {

public static void Sort(double[] num) {

Arrays.*sort*(num);

double sum=0.0;

for (int e=0;e

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

sum=sum+NewNum[I];

}

average=sum/NewNum.length;

System.*out*.println(average);

}

}

5.利用选择排序对数据进行降序排序

package practise;

public class Select_Sort {

//原理:在一组数组里面定义一个最大数值的下标,让int[index]和其它数值挨个比较,选出最大的值int[i],

// 并把该最大值的下标i和我们原先设置的index进行置换,即index=i;

//并且把他们两个的位置进行互换,依次类推,直到完全排序好

public static void main(String[] args){

int[] num=new int[]{4,3,1,6,9,5};

*ChooseSort*(num);

}

public static void ChooseSort(int[] array){

for(int I=0;i

Int index=i;//定义当前下标为最小值下标

for(int j=I+1;j

if(array[j]

index =j;

}

}

int temp = array[index];//交换

array[index] = array[I];

array[I] = temp;

}

for (int e:array){

System.*out*.print(e+”\t”);

}

}

}

6.定义数组,存放5个学生的成绩【成绩值自己设定】,将成绩从大到小排序,获得成绩之和,平均成绩,最小成绩,最大成绩。

package practise;

import java.util.Arrays;

public class StudentScore {

public static void Sort(double[] num) {

Arrays.*sort*(num);

double sum=0.0;

for (int e=0;e

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

Int index=i;//定义当前下标为最小值下标

for(int j=I+1;j

if(array[j]

index =j;

}

}

int temp = array[index];//交换

array[index] = array[I];

array[I] = temp;

}

for (int e:array){

System.*out*.print(e+”\t”);

}

}

}

6.定义数组,存放5个学生的成绩【成绩值自己设定】,将成绩从大到小排序,获得成绩之和,平均成绩,最小成绩,最大成绩。

package practise;

import java.util.Arrays;

public class StudentScore {

public static void Sort(double[] num) {

Arrays.*sort*(num);

double sum=0.0;

for (int e=0;e

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

if(array[j]

index =j;

}

}

int temp = array[index];//交换

array[index] = array[I];

array[I] = temp;

}

for (int e:array){

System.*out*.print(e+”\t”);

}

}

}

6.定义数组,存放5个学生的成绩【成绩值自己设定】,将成绩从大到小排序,获得成绩之和,平均成绩,最小成绩,最大成绩。

package practise;

import java.util.Arrays;

public class StudentScore {

public static void Sort(double[] num) {

Arrays.*sort*(num);

double sum=0.0;

for (int e=0;e

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

index =j;

}

}

int temp = array[index];//交换

array[index] = array[I];

array[I] = temp;

}

for (int e:array){

System.*out*.print(e+”\t”);

}

}

}

6.定义数组,存放5个学生的成绩【成绩值自己设定】,将成绩从大到小排序,获得成绩之和,平均成绩,最小成绩,最大成绩。

package practise;

import java.util.Arrays;

public class StudentScore {

public static void Sort(double[] num) {

Arrays.*sort*(num);

double sum=0.0;

for (int e=0;e

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

sum=sum+num[e];

}

System.*out*.println(“max=“+num[num.length-1]);

System.*out*.println(“min=“+num[0]);

System.*out*.println(“average=“+sum/num.length);

System.*out*.println(“sum=“+sum);

}

public static void main(String[] agrs){

double[] num=new double[]{99,97,96,95,94,92,91,90,88,100};

*Sort*(num);

}

}

7.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package practise;

import java.util.Arrays;

public class TheSeven {

public static void main(String[] args){

int[] num= new int[]{99,97,96,95,94,92,91,90,88,100};

Arrays.*sort*(num);

int evensum=0;

int oddsun=0;

for(int I=0;i

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}

if(num[I]%2==0){

evensum++;

}else if(num[I]%3==0){

oddsun++;

}

}

System.*out*.println(“max=“+num[0]+”,min=“+num[num.length-1]);

System.*out*.println(“奇数的个数=“+oddsun+”偶数的个数=“+evensum);

}

}

8.提取一个方法,将指定数组中的数组元素进行反转

例如:{10,23,2,45,6}—>{6,45,2,23,10}

package practise;

public class BackOverNumberlist {

public static void main(String[] args){

int[] array=new int[]{1,2,3,4,5,6,7,8};

*BackOver*(array);

}

public static void BackOver(int[] array){

for(int i=array.length-1;i>=0;i--){

System.*out*.print(array[i]+" ");

}

}

}

扩展练习

输出100到1000的水仙花数:

public class LoopTest{

public static void main(String[] args){

int bai = 0;

int shi = 0;

int ge = 0;

for(int i = 100; i < 1000; i++){

bai = i/100;

shi = i/10%10;

ge = i%10;

if(bai*bai*bai+shi*shi*shi+ge*ge*ge == i ){

System.out.println(i);

}

}

}

}

打印所有字母:

public class LoopTest{

public static void main(String[] args){

charhttp:// lower = 'a';

char upper = 'A';

for(int i = 0 ; i < 26 ; i++){

System.out.println(lower+" "+upper);

lower++;

upper++;

}

}

}


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