java运算符运算方法(java运算符是什么类型)

1.

  
package operator;

public class Demo01 {
    public static void main(String[] args) {
        //二元运算符（算术运算符）
        // Ctrl + D ：复制当前行到下一行
        int a = 10;
        int b = 20;
        int c = 30;
        int d = 40;

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

2. 

package operator;

public class Demo02 {
        //赋值运算符
    public static void main(String[] args) {
         long  a = 12316546555615613L;
         int   b = 125;
         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

    }
}

3.

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

        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 
 
 
 
4.
 
package operator;

import static java.lang.Math.*;

public class Demo04 {
    public static void main(String[] args) {
        // ++  --    自增，自减   一元运算符
        int a = 3;

        int b = a++;//执行完这行代码，先给b赋值，再自增
        //a = a + 1
        System.out.println(a);
        //a = a + 1
        int c = ++a;//执行完这行代码，先自增，再给c赋值
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);
        
        //幂运算 2^3   2*2*2 = 8   很多运算，我们会使用一些工具类来操作
        double pow = Math.pow(2, 3);
        System.out.println(pow);
    }
}
 
 
 
 
5.
 
package operator;

public class Demo05 {
    //逻辑运算符
    public static void main(String[] args) {
        // 与(and)  或(or)   非(取反)
        boolean a = true;
        boolean b = false;

        System.out.println("a&&b:"+(a&&b));//逻辑与运算：两个变量都为真，结果才为true
        System.out.println("a||b:"+(a||b));//逻辑或运算：俩个变量有一个为真，则结果才为true
        System.out.println("!(a&&b):"+!(a&&b));//如果为真，则变为假，如果是假，则变为真

        //短路运算
        int c = 5;
        boolean d = (c<4)&&(c++<4);
        System.out.println(d);
        System.out.println(c);

    }
}
 
 
 
 
6.
 
 
package operator;

public class Demo06 {
    public static void main(String[] args) {
        
        System.out.println(2<<3);
    }
}
 
 
 
 
 
7.
 
package operator;

public class Demo07 {
    public static void main(String[] args) {
     int a = 10;
     int b = 20;

     a+= b;//a+=a+b
     a-= b;//a-=a-b
        System.out.println(a);
     //字符串连接符 + , String
        System.out.println(a+b);
        System.out.println(""+a+b);//""在前面，ab拼接
        System.out.println(a+b+"");//“”在后面，ab进行运算
    }
}
 
 
 
 
 
 
8.
 
 
package operator;

public class Demo08 {
    public static void main(String[] args) {
        // x ? y : z
        //如果x==true，则结果为y，否则结果为z

        int score = 80;
        String type = score < 60 ? "不及格" : "及格";//必须掌握
        //if
        System.out.println(type);


    }
}