算术运算符：

它们用于对原始数据类型执行简单的算术运算。

• *：乘法
• /：分区
• ％：模数
• +：加法
• - ：减法

// Java program to illustrate
// arithmetic operators
public class operators 
{
    public static void main(String[] args) 
    {
        int a = 20, b = 10, c = 0, d = 20, e = 40, f = 30;
        String x = "Thank", y = "You";

        // + and - operator
        System.out.println("a + b = "+(a + b));
        System.out.println("a - b = "+(a - b));

        // + operator if used with strings
        // concatenates the given strings.
        System.out.println("x + y = "+x + y);

        // * and / operator
        System.out.println("a * b = "+(a * b));
        System.out.println("a / b = "+(a / b));

        // modulo operator gives remainder
        // on dividing first operand with second
        System.out.println("a % b = "+(a % b));

        // if denominator is 0 in division
        // then Arithmetic exception is thrown.
        // uncommenting below line would throw
        // an exception
        // System.out.println(a/c);
    }
}

输出：

a + b = 30 ab = 10 x + y = ThankYou a * b = 200 a / b = 2 a％b = 0

Java中的加法和连接

可以观察下面的一段代码，和输出的结果：

public class Geeksforgeeks
{
    public static void main(String[] args)
    {
        System.out.println(2+0+1+6+"GeeksforGeeks");
        System.out.println("GeeksforGeeks"+2+0+1+6);
        System.out.println(2+0+1+5+"GeeksforGeeks"+2+0+1+6);
        System.out.println(2+0+1+5+"GeeksforGeeks"+(2+0+1+6));
    }
}

输出是

9GeeksforGeeks
GeeksforGeeks2016
8GeeksforGeeks2016
8GeeksforGeeks9

可以思考一下，解析答案在这篇文章：Java中的加法和连接