Java数组,去掉重复值、增加、删除数组元素的方法

Java数组,去掉重复值、增加、删除数组元素的方法

如下所示：

import java.util.List;

import java.util.ArrayList;

import java.util.Set;

import java.util.HashSet;

public class lzwCode {

public static void main(String [] args) {

testA();

System.out.println("===========================");

testB();

System.out.println("===========================");

testC();

}

//去掉数组中重复的值

public static void testA() {

String [] str = {"Java", "C++", "php", "C#", "python", "C++", "Java"};

for (String elementA:str ) {

System.out.print(elementA + " ");

}

List list = new ArrayList();

for (int i=0; i

if(!list.contains(str[i])) {

list.add(str[i]);

}

}

/*

Set set = new HashSet();

for (int i=0; i

set.add(str[i]);

}

String[] newStr = set.toArray(new String[1]);

*/

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

//删除数组中其中一个元素eVOQaSgYWa

public static void testB() {

String [] str = {"Java", "C++", "Php", "C#", "Python"};

for (String elementA:str ) {

System.out.print(elementA + " ");

}

//删除php

List list = new ArrayList();

for (int i=0; i

list.add(str[i]);

}

list.remove(2); //list.remove("Php")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

//在数组中增加一个元素

public static void testC() {

String [] str = {"Java", "C++", "Php", "C#", "Python"};

for (String elementA:str ) {

System.out.print(elementA + " ");

}

//增加ruby

List list = new ArrayList();

for (int i=0; i

list.add(str[i]);

}

list.add(2, "ruby"); //list.add("ruby")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

}

控制台结果：

if(!list.contains(str[i])) {

list.add(str[i]);

}

}

/*

Set set = new HashSet();

for (int i=0; i

set.add(str[i]);

}

String[] newStr = set.toArray(new String[1]);

*/

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

//删除数组中其中一个元素eVOQaSgYWa

public static void testB() {

String [] str = {"Java", "C++", "Php", "C#", "Python"};

for (String elementA:str ) {

System.out.print(elementA + " ");

}

//删除php

List list = new ArrayList();

for (int i=0; i

list.add(str[i]);

}

list.remove(2); //list.remove("Php")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

//在数组中增加一个元素

public static void testC() {

String [] str = {"Java", "C++", "Php", "C#", "Python"};

for (String elementA:str ) {

System.out.print(elementA + " ");

}

//增加ruby

List list = new ArrayList();

for (int i=0; i

list.add(str[i]);

}

list.add(2, "ruby"); //list.add("ruby")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

}

控制台结果：

set.add(str[i]);

}

String[] newStr = set.toArray(new String[1]);

*/

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

//删除数组中其中一个元素eVOQaSgYWa

public static void testB() {

String [] str = {"Java", "C++", "Php", "C#", "Python"};

for (String elementA:str ) {

System.out.print(elementA + " ");

}

//删除php

List list = new ArrayList();

for (int i=0; i

list.add(str[i]);

}

list.remove(2); //list.remove("Php")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

//在数组中增加一个元素

public static void testC() {

String [] str = {"Java", "C++", "Php", "C#", "Python"};

for (String elementA:str ) {

System.out.print(elementA + " ");

}

//增加ruby

List list = new ArrayList();

for (int i=0; i

list.add(str[i]);

}

list.add(2, "ruby"); //list.add("ruby")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

}

控制台结果：

list.add(str[i]);

}

list.remove(2); //list.remove("Php")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

//在数组中增加一个元素

public static void testC() {

String [] str = {"Java", "C++", "Php", "C#", "Python"};

for (String elementA:str ) {

System.out.print(elementA + " ");

}

//增加ruby

List list = new ArrayList();

for (int i=0; i

list.add(str[i]);

}

list.add(2, "ruby"); //list.add("ruby")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

}

控制台结果：

list.add(str[i]);

}

list.add(2, "ruby"); //list.add("ruby")

System.out.println();

String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组

for (String elementB:newStr ) {

System.out.print(elementB + " ");

}

System.out.println();

}

}

控制台结果：

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