package com.liu.operator;

public class Demo4 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        a+=b;// a=a+b
        System.out.println(a);
        //字符串链接符   String
        //如果输出语句有字符串类型 字符串类型前面会运算，后面的不会运算会拼接
        System.out.println(a+b+" "+a+b);
        System.out.println(" "+a+b);

    }
}

字符串链接符拓展