// 二元运算符
        //Ctrl+D : 复制当前行到下一行
        int a = 10;
        int b = 20;
        int c = 25;
        int d = 25;

        System.out.println(a+b);
        System.out.println(a-b);
        System.out.println(a*b);
        System.out.println(a/(double)b);

赋值运算符

关系运算符

package operator;

public class Demo03 {
    public static void main(String[] args) {
      //关系运算符返回的结果：  正确，错误  布尔值
     //  if
        int a =10;
        int b =20;
        int c =21;

        //取余，模运算
        System.out.println(c%a);//c / a   21/10

        System.out.println(a>b);
        System.out.println(a<b);
        System.out.println(a==b);
        System.out.println(a!=b);

    }
}