java语法

算数运算符

package operator;

public class Demo01 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        int c = 25;
        int d = 25;

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

>0
>0.5

自增运算符,幂运算符

package operator;

public class Demo02 {
    public static void main(String[] args) {
    //自增运算    
        int a = 3;
        int b = a++;
        //b=a ; a=a+1
        //a=a+1
        //c=a
        int c = ++a;
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);
    //幂运算
        double pow = Math.pow(2,3);
        System.out.println(pow);
    }
}

>5
>3
>5
>8.0

逻辑运算符、短路运算符

package operator;

public class Demo03 {
    public static void main(String[] args) {
        //短路运算
        int c = 5;
        boolean d = (c<4)&&(c++<4);//如果前面判断是错误后面计算机不会执行。如下：
        System.out.println(d);
        System.out.println(c);
    }
}

>false
>5

位运算符

package operator;

public class Demo04 {
    public static void main(String[] args) {
    
        System.out.println(2<<3);
    }
}

>16

字符串拼接

package operator;

public class Demo05 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;

        System.out.println(" "+a+b);
        System.out.println(a+b+" ");


    }

}

> 1020
>30 

条件运算符

package operator;

public class Demo06 {
    public static void main(String[] args) {
        int score = 80;
        String s = score > 70 ? "及格" : "不及格";
        System.out.println(s);
    }
}

>及格