How to use increment and decrement operators in Java

1. n adds 1 to the current value of variable n, n--decreases the value of variable n by 1.

2. These operators change the value of the variable and cannot be applied to the value itself.

3. In the expression, n means to increment first and then assign a value; n means to assign a value first and then increment.

Example

//与打印操作混合使用
int num2 = 20;
//混合使用，先++，变量立刻马上变成21，然后打印结果21
System.out.println(++num2);//21
System.out.println(num2);//21
System.out.println("===========");
int num3=30;
//混合使用，后++，首先使用变量本来的30，然后让变量+1得到31
System.out.println(num3++);//30
System.out.println(num3);//31
System.out.println("============");
int num4 =40;
//和赋值操作混合
int result1 = --num4;//混合使用，前--，变量立刻马上-1变成39，然后将结果39交给result1变量
System.out.println(result1);//39
System.out.println(num4);//39
System.out.println("============");
int num5 =50;
//混合使用，后--，首先把本来的数字50交给result2，然后我自己再-1变成49
int result2 = num5--;
System.out.println(result2); //50
System.out.println(num5);  //49
System.out.println("=============");
int x = 10;
int y = 20;
//11+20=31
int result3 = ++x + y--;
System.out.println(result3); //31
System.out.println(x);  //11
System.out.println(y);  //19
//30++;//错误写法! 常量不可以使用++或者--
}

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