java笔记学习之操作符

java笔记学习之操作符

0x001 算数运算符

int num1 = 1, num2 = 2;

System.out.println(num1 + num2); // 3

System.out.println(num1 - num2); // -1

System.out.println(num1 / num2); // 0

System.out.println(num1 * num2); // 2

System.out.println(num1 % num2); //1

0x002 自增自减

System.out.println(num1++); // 1

System.out.println(num1); // 2

System.out.println(num1--); // 2

System.out.println(num1); // 1

System.out.println(++num1); // 2

System.out.println(--num1); // 1

0x003 关系操作符

System.out.println((num1 < num2)); // true

System.out.println((num1 > num2)); // false

System.out.println(num1 == num2); // false

System.out.println(num1 != num2); // true

0x004 逻辑操作符

boolean boolean1 = false;

boolean boolean2 = true;

System.out.println(boolean1 && boolean2); // false

System.out.println(boolean1 || boolean2); // true

System.out.println(!boolean1); // true

0x005 直接操作符

int i1 = 0x2f;

int i2 = 0x2F;

int i3 = 0177;

char c1 = 0xffff;

byte b1 = 0x7f;

short s1 = 0x7f;

long l1 = 100L;

long l2 = 100l;

float f1 = 1;

float f2 = 1f;

float f3 = 1F;

double d1 = 1d;

double d2 = 1D;

System.out.println(i1); // 47

System.out.println(i2); //47

System.out.println(i3); // 127

System.out.println(c1); //

System.out.println(b1); // 127

System.out.println(s1); // 127

System.out.println(l1); // 100

System.out.println(l2); // 100

System.out.println(f1); // 1.0

System.out.println(f2); // 1.0

System.out.println(f3); // 1.0

System.out.println(d1); // 1.0

System.out.println(d2); // 1.0

0x006 三元运算符

int a = 0;

boolean isSuccess = false;

a = isSuccess ? 1 : 2;

Systemhttp://.out.println(a);// 2

0x007 字符串+、+=

String str = "";

str = str + "1";

str += "2";

System.out.println(str);

0x008 类型转化

int i = 100;

long long1 = (long) i;

System.out.println(long1);// 100

long1 = i;

System.out.println(long1);// 100

long long2 = (long) 200;

System.out.println(long2);// 200

i = (int) long1;

System.out.println(i); // 200

float float1=0.1f;

float float2=0.9f;

System.out.println((int) float1);// 转化int会被舍去

System.out.println((int) float2);// 转化int会被舍去

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