1、位运算符:~操作符的使用
public class Test22{
public static void main(String[] args){
int number1 = 2;
/* 符号位:0:代表整数 1:代表负数
0000 0000 0000 0000 0000 0000 0000 0010
取反: 1111 1111 1111 1111 1111 1111 1111 1101取反后发现为负数的二进制。
负数的二进制转换为十进制:需取反再+1.
负数的补码:反码+1
1000 0000 0000 0000 0000 0000 0000 0010
+ 1
—————————————
1000 0000 0000 0000 0000 0000 0000 0011——(-3)
*/
System.out.println(~2); } }
2、
public class Test{
public static void main(String[] args){
int number = 8;
/*
0000 0000 0000 0000 0000 0000 0000 1000(原码)
取反 1111 1111 1111 1111 1111 1111 1111 0111(补码)
负数原码=负数补码取反+1
1000 0000 0000 0000 0000 0000 0000 1000 (补码取反)
+ 1
—————————————
1000 0000 0000 0000 0000 0000 0000 1001 —》-9 */
System.out.println(~8); } }
3、逻辑运算符的使用
public class LuoJiTest{
public static void main(String[] args){
int number1 = 20;
int number2 = 30;
//–&&:短路与
//–(number1>number2):false (number1>10):true
// false&&true
System.out.println(“&&:短路与:”+((number1>number2)&&(number1>10)));
//–||:短路或
// false||true
System.out.println(“||:短路或:”+((number1>number2)||(number1>10)));
//–!:非运算符
//number1>number2-> 20>30 –false
System.out.println(“!:非运算符:”+(!(number1>number2)));
//–&:单与
System.out.println(“&:单与”+((number1>number2)&(number1>10)));
//–|:单或
System.out.println(“|:单或”+((number1>number2)|(number1>10)));
//–^:异或
//(number1>number2):false (number1>10):true
//false^true
System.out.println(“^异或:”+((number1>number2)^(number1>10)));
System.out.println(true^true);
System.out.println(false^false);
}
}
4、实现从键盘输入一个三位整数,并逆序输出
import java.util.Scanner;
public class HomeWorkTest{
public static void main(String[] args){
Scanner scan = new Scanner(System.in);
int number = scan.nextInt();
int baiWei = number/100;
int shiWei = number%100/10;
int geWei = number%100%10;
System.out.println(“起始数据为:”+number);
System.out.println(“转换之后为:”+geWei+””+shiWei+””+baiWei);
}
}