package operator;
//逻辑运算符
public class Demo05 {
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：两个变量有一个为真，则结果才为true
System.out.println("! (a && b):"+ (a && b));//如果是真，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);
}
}
package operator;
public class Demo06 {
public static void main(String[] args) {
System.out.println(2<<3);
}
}
//位运算符
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);
System.out.println(a+b+"");
}
}
