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逻辑预算符: && , || , ! (与或非)
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位运算符: & , | , ^ , >> , << , >>>
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条件运算符 ? :
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扩展赋值运算符: += , -= , *= , /=
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 $$ b"+(a&&b));//逻辑运算: 两个变量都为真才为ture
System.out.println("a || b"+(a||b));//逻辑运算: 两个变量有一个为真,结果才为ture
System.out.println("!(a $$ b)"+!(a&&b));//逻辑运算,如果是真则为假,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);
}
}
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位运算符: & , | , ^ , >> , << , >>>
package operator;
public class Demo06 {
public static void main(String[] args) {
/*
A = 0011 1100
B = 0000 1101
--------------------------
A&B = 0000 1100
A|B = 0011 1101
A^B = 0011 0001
~B = 1111 0010
2*8 = 16 2*2*2*2
效率极高!!!
<< *2
>> /2
0000 0000 0
0000 0001 1
0000 0010 2
0000 0011 3
0000 0100 4
0000 1000 8
0001 0000 16
*/
System.out.println(2<<3);
}
}
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扩展赋值运算符: += , -= , *= , /=
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+"");
}
}
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条件运算符 ? :
package operator;
import org.omg.CORBA.StringHolder;
//三元运算符
public class Demo08 {
public static void main(String[] args) {
//x ? y : z
//如果x==true,则结果我y,否则为z
int score = 80;
String type = score <60 ? "不及格":"及格";//必须掌握
//if
System.out.println(type);
}
}