算术运算符:+,-,*,/,%,++,--
赋值运算符:=
逻辑运算符:&&,||,!
位运算符:&,|,^,~,>>,<<,>>>(了解!!!)
条件运算符: ? :
package operator;
?
public class Demo01 {
public static void main(String[] args) {
//二元运算符
//ctrl + D:复制当前行到下一行
int a = 10;
int b = 20;
int c = 30;
int d = 40;
?
System.out.println(a+b);//加
System.out.println(a-d);//减
System.out.println(a*c);//乘
System.out.println(c/(double)b);//除
}
}
?
package operator;
?
public class Demo02 {
public static void main(String[] args) {
long a = 1345674616464748946L;
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
}
}
package operator;
?
public class Demo03 {
public static void main(String[] args) {
//关系运算符返回的结果:正确 错误 布尔值
int a = 10;
int b = 20;
int c = 21;
?
//取余,,模运算
System.out.println(c%a);
?
System.out.println(a>b);
System.out.println(a<b);
System.out.println(a == b);
System.out.println(a != b);
}
}
?
package operator;
?
public class Demo04 {
public static void main(String[] args) {
//++ -- 自增,自减 一元运算符、
int a = 1;
int b = a++;//执行完这行代码后,先给b赋值,再自增
?
//a = a + 1;
System.out.println(a);
//a = a + 1;
int c = ++a;//执行这行代码前,先自增再给c赋值
?
System.out.println(a);
System.out.println(b);
System.out.println(c);
?
//幂运算 2^3 2*2*2 = 8 很多运算,我们会使用一些工具类来操作!
double pow = Math.pow(2,3);
System.out.println(pow);
}
}
?
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,结果才为真。
System.out.println("a || b:" + (a||b));//逻辑或运算:两个变量有一个为真,结果就为真。
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 = 1;
boolean d = (c<1&&c++<1);
System.out.println(c);
System.out.println(d);
}
}
package operator;
?
//位运算符
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 2*2*2*2 = 16
效率极高!!!
>>:右移 -> /2
<<:左移 -> *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);
}
}
package operator;
?
public class Demo07 {
public static void main(String[] args) {
//扩展赋值运算符
int a = 10;
int b = 20;
a += b;//a = a + b;
?
System.out.println(a);
?
a -= b;//a = a - b;
?
System.out.println(a);
?
//字符串连接符 +
System.out.println(a+b);
//字符串连接符 +, String
System.out.println(""+a+b);//1020
System.out.println(a+b+"");//30
System.out.println(a+b+""+a);//3010
}
}
package operator;
?
//三元运算符
public class Demo08 {
public static void main(String[] args) {
//x ? y : z
//如果x == true,则结果为真,否则结果为z
?
int score01 = 80;
String typeA = score01>60?"及格":"不及格";//必须掌握!
?
System.out.println(typeA);
?
int score02 = 50;
String typeB = score02>60?"及格":"不及格";
System.out.println(typeB);
}
}
原文:https://www.cnblogs.com/duxian/p/14170604.html