算术运算符:+,-,*,/,%,++,--
赋值运算符:=
关系运算符:>, <, >=, <=, ==, !=instance of
逻辑运算符:&&,||,!
位运算符:&,|,^, ~ , >> , << , >>>(了解!!!)
条件运算符:?:
拓展赋值运算符: +=, -= , *=,/=
public static void main(String[] args) {
//二元运算符
//Ctrl + D : 复制当前行带下一行
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);
}
public static void main(String[] args) {
long a = 123213123213213L;
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
System.out.println();
}
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 = 22;
//取余,模运算
System.out.println(c%a);//c / a 21 / 10 = 2 ... 1
System.out.println(a>b);
System.out.println(a<b);
System.out.println(a==b);
System.out.println(a!=b);
}
public static void main(String[] args) {
//++ -- 自增,自减 一元运算符
int a = 3;
int b = a++;//执行完这行代码,先给b赋值,再自增
System.out.println(a);
int c = ++a;//执行完这行代码,先自增,再给b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(3, 3);
System.out.println(pow);
}
public static void main(String[] args) {
// 与(and) 或(for) 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));//逻辑与运算: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);
}
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);
}
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+"");
}
public static void main(String[] args) {
//x ? y : z
//如果x==true,则结果为y,否则结果为z
int score = 50;
String type = score < 60 ?"不及格":"及格";//必须掌握
System.out.println(type);
}
原文:https://www.cnblogs.com/JackHe-/p/14594431.html