java运算符

发表于 | 分类于

Java 运算符

主要分为一下几种

  1. 算术运算符
  2. 关系运算符
  3. 位运算符
  4. 逻辑运算符
  5. 赋值运算符
  6. 其他运算符

算术运算符

ArithmeticOperator.java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
public class ArithmeticOperator {

    public static void main(String args[]) {
       int a = 10;
       int b = 20;
       int c = 25;
       int d = 25;
       System.out.println("a + b = " + (a + b) );
       System.out.println("a - b = " + (a - b) );
       System.out.println("a * b = " + (a * b) );
       System.out.println("b / a = " + (b / a) );
       System.out.println("b % a = " + (b % a) );
       System.out.println("c % a = " + (c % a) );
       System.out.println("a++   = " +  (a++) );
       System.out.println("a--   = " +  (a--) );
       // 查看  d++ 与 ++d 的不同
       System.out.println("d++   = " +  (d++) );  // 当前语句后 +1
       System.out.println("++d   = " +  (++d) );  // 当前语句前 +1
    }
  }

关系运算符

RelationalOperator.java

1
2
3
4
5
6
7
8
9
10
11
12
13
public class RelationalOperator {

   public static void main(String args[]) {
      int a = 10;
      int b = 20;
      System.out.println("a == b = " + (a == b) );
      System.out.println("a != b = " + (a != b) );
      System.out.println("a > b = " + (a > b) );
      System.out.println("a < b = " + (a < b) );
      System.out.println("b >= a = " + (b >= a) );
      System.out.println("b <= a = " + (b <= a) ); 
   } 
}

逻辑运算符

LogicalOperators.java

1
2
3
4
5
6
7
8
9
public class LogicalOperators {
   public static void main(String args[]) {
      boolean a = true;
      boolean b = false;
      System.out.println("a && b = " + (a&&b));
      System.out.println("a || b = " + (a||b) );
      System.out.println("!(a && b) = " + !(a && b));
   }
 }

赋值运算符

AssignmentOperator.java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
public class AssignmentOperator {
   public static void main(String args[]) {
      int a = 10;
      int b = 20;
      int c;
      c = a + b;
      System.out.println("c = a + b is " + (a + b));
      System.out.println("c += a  is " + (c+=a) );
      System.out.println("c -= a is " + (c -=a));
      System.out.println("c *= a is " + (c *= a));
      a = 10;
      c = 15;
      System.out.println("c /= a is " + (c/=a) );
      a = 10;
      c = 15;
      System.out.println("c %= a  is " + (c %= a));
   }
 }

条件运算符

ConditionalOperator.java

1
2
3
4
5
6
7
8
9
10
public class ConditionalOperator {
   public static void main(String args[]){
      int a , b;   
      a = 10;    
      b = (a == 1) ? 20: 30;   // 不成立 
      System.out.println( "Value of b is : " +  b );  // 30
      b = (a == 10) ? 20: 30;    // 成立
      System.out.println( "Value of b is : " + b );  // 20
   }
}

instanceOf 运算符

Car.java

1
2
3
4
5
6
7
8
9
class Vehicle {}

public class Car extends Vehicle {  // Car 继承了Vehicle所有属性和方法
   public static void main(String args[]){
      Vehicle a = new Car();
      boolean result =  a instanceof Car;   // 被比较的对象兼容于右侧类型,该运算符仍然返回true
      System.out.println( result);  // true
   }
}