Java 比较运算符示例

 Java 运算符

下面的示例说明了 Java 比较运算符的用法:==、!=、>、<、>=、<=。

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

上述代码的输出将是:

10 == 10: true
10 != 10: false
10 < 20: true
10 > 20: false
10 = 20: false

这些比较运算符通常返回布尔结果，这非常有用，可以用来构造条件语句，如下例所示:

public class MyClass {
  static void range_func(int x){
    //&&运算符用于组合条件
    //仅当 x >= 10 且 x <= 25 时才返回 true
    if(x >= 10 && x <= 25)
      System.out.println(x +" belongs to range [10, 25]."); 
    else
      System.out.println(x +" do not belongs to range [10, 25].");
  }

  public static void main(String[] args) {
    range_func(15);
    range_func(25);
    range_func(50);
  }
}

上述代码的输出将是:

15 belongs to range [10, 25].
25 belongs to range [10, 25].
50 do not belongs to range [10, 25].