運算子

java語言支援如下運算子：

• 算術運算子:+，-，*，l， %，++，
• 賦值運算子=
• 關係運算符:>，<，>=，<=，==，!= instanceof
• 邏輯運算子: &&，|，!
• 位運算子:&，|，^, ~，>>，<<，>>>(瞭解!! ! )
• 條件運算子?∶
• 擴充套件賦值運算子:+=，-=，*=，/=

package opertaor;

public class Demo01 {
    public static void main(String[] args) {
        //二元運算子
        //Ctrl+D:複製當前行到下一行
        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 );//強制型別轉換   0.5
    }
}
 

//執行結果
30
-10
200
0.5

Process finished with exit code 0

package opertaor;

public class Demo02 {
    public static void main(String[] args) {
        long a=12312321341432L;
        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
    }
}
 

//運算結果
12312321341573
141
18

Process finished with exit code 0

package opertaor;

public class Demo03 {
    public static void main(String[] args) {
        //關係運算符返回的結果：正確，錯誤  布林值
        int a=10;
        int b=20;
        int c=22;
        //取餘，模運算
        System.out.println(c%a);       //c/a        22/10=2.......1
        System.out.println(a>b);
        System.out.println(a<b);
        System.out.println(a==b);
        System.out.println(a!=b);
    }
}
 

2
false
true
false
true

Process finished with exit code 0