Java基础知识(一) 自增、自减运算符

.d1 { border-style: none }
.d2 { border-style: solid }
.d3 { border-style: dotted }
.d4 { border-style: dashed }
.d5 { border-style: double }
.d6 { border-style: groove }
.d7 { border-style: ridge }
.d8 { border-style: inset }
.d9 { border-style: outset }

自增、自减运算符

自增运算符++，将数值增加1；自减运算符--，将数值减少1

自增代码举例

package com.scd.chapter1;

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int m = 7;
        int n = 7;
        int x = 2 * m++;
        int y = 2 * ++n;
        System.out.println("m="+m);
        System.out.println("n="+n);
        System.out.println("x="+x);
        System.out.println("y="+y);

    }

}

输出结果为

m=8
n=8
x=14
y=16

自减代码举例

package com.scd.chapter1;

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int m = 7;
        int n = 7;
        int x = 2 * m--;
        int y = 2 * --n;
        System.out.println("m="+m);
        System.out.println("n="+n);
        System.out.println("x="+x);
        System.out.println("y="+y);

    }

}

输出结果为

m=6
n=6
x=14
y=12