13 运算符
13 运算符
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算术运算符:+, -, *, /, %(取余/模运算), ++, --
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赋值运算符:=
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关系运算符:>, <, >=, <==, ==(等于), !=(不等于), instanceof
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逻辑运算符:&&, ||, ! 与或非
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位运算符:&, |, ^, ~, >>, <<, >>>(了解!!!)
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条件运算符?:
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扩展赋值运算符:+=, -=, *=, /=
算法运算符
package operator;
public class operator {
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=25;
int d=25;
System.out.println(a+b);
System.out.println(a-b);
System.out.println(a*b);
System.out.println(a/b);//应该是0,5结果输出0 省略了小数点后面的数
System.out.println(a/(double)b);//0.5 转换类型之后输出正确package operator;
public class demo02 {
public static void main(String[] args) {
long a =123123123123L;
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
//if
int a =10;
int b =20;
int c =21;
//取余/模运算
System.out.println(c%a);//1 c除以a 取余数 所以等于1
System.out.println(a>b);//false
System.out.println(a<b);//true
System.out.println(a==b);//false
System.out.println(a>=b);//false
System.out.println(a!=b);//true
}
}