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Java基础07:基础运算符

Java基础07:基础运算符

  1. 算术运算符:+,-,*,/,%(取余(模运算)),++,--;
  2. 赋值运算符=
  3. 关系运算符:>,<,>=,<=,==,!=(不等于)instanceof
  4. 逻辑运算符:&&,||,! (与,或,非)
  5. 位运算符:&,|,^,~,>>,<<,>>>(了解!!)
  6. 条件运算符? :
  7. 扩展赋值运算符:+=,-=,*=,/=

note:运算时有一个为long类型,则结果也为long类型;

​ 没有long类型时,则结果为int类型;

​ 以此按优先级类推,结果为short和byte时自动转为int;(原因在于short和byte或short相加可能会溢出,会强制转换成int类型)

代码部分:

package operator;

public class Demo01 {
    public static void main(String[] args) {
        // 二元运算符
        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);


    }
}
package operator;

public class Demo02 {
    public static void main(String[] args) {
        long a = 123123123123L;
        int b = 123;
        short c = 10;
        byte d = 8;

        System.out.println(a+b+c+d);//Long
        System.out.println(b+c+d);//Int
        System.out.println(c+d);//Int
    }
}
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 = 2 ... 1

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

posted on 2021-07-24 21:21  胖子_Blog  阅读(36)  评论(0编辑  收藏  举报

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