java基础运算学习-luke

[luke_test (路客)]

算术运算符

package com.luke.ch02_operator;

public class MathDemo {
    public static void main(String[] args) {
        //初始化变量
        int a=20;
        int b=3;

        //算术运算符+-*/%
        System.out.println(a+b);
        System.out.println(a-b);
        System.out.println(a*b);
        System.out.println(a/b); //不能整除的时候，得到也是商，不会是小数
        System.out.println(a%b);

        //自增++和自减--
        a++;
        System.out.println(a);

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

        int c = b++;  //b先赋值给c，再自增
        System.out.println(c);

        int d = ++b;  //b先自增再赋值给d
        System.out.println(d);

    }
}

关系运算符

package com.luke.ch02_operator;

public class RelationDemo {
    public static void main(String[] args) {
        char a='A';
        int b=69;
        int c=65;
        System.out.println(a==c);
        System.out.println(a>b);
        System.out.println(a!=c);
        System.out.println(a<c);
        System.out.println(a>=c);
        System.out.println(b<=a);
    }
}

逻辑运算符

package com.luke.ch02_operator;

public class LogicDemo {
    public static void main(String[] args) {
        boolean a=true;
        boolean b=false;
        int c=0;
        int d=1;
        char e='A';
        System.out.println(a&b);
        System.out.println(a|b);
        System.out.println(!b);
        System.out.println(c&d);//直接进行与运算，转换为二进制
        System.out.println(c|e);//e先转换为int类型，然后都转换为二进制
    }
}

赋值运算符

package com.luke.ch02_operator;

public class AssignDemo {
    public static void main(String[] args) {
        int a=10;
        int b=10;
        int c=10;
        int d=10;
        int e =10;
        a += 2;
        System.out.println(a);

        b -=2;
        System.out.println(b);

        c *= 2;
        System.out.println(c);

        d /= 4;
        System.out.println(d);

        e %= 3;
        System.out.println(e);
    }
}