Java中的类 hashCode() 方法及示例

Java.lang.Class 类的hashCode()方法用于获取该实体的 hashCode 表示。此方法返回一个整数值，即 hashCode。

句法：

public int hashCode()

参数：此方法不接受任何参数。

返回值：此方法返回一个整数值，即 hashCode。

下面的程序演示了 hashCode() 方法。

示例 1：

// Java program to demonstrate hashCode() method
  
public class Test {
    public static void main(String[] args)
        throws ClassNotFoundException
    {
        // returns the Class object for the class
        // with the specified name
        Class c1 = Class.forName("java.lang.String");
  
        System.out.println("Class represented by c1: "
                         + c1);
  
        // hashCode method on c1
        System.out.println("HashCode value: "
                           + c1.hashCode());
    }
}

输出：

Class represented by c1: class java.lang.String
HashCode value: 589431969

示例 2：

// Java program to demonstrate hashCode() method
  
public class Test {
    public static void main(String[] args)
        throws ClassNotFoundException
    {
        // returns the Class object for the class
        // with the specified name
        Class c1 = int.class;
  
        System.out.println("Class represented by c1: "
                         + c1);
  
        // hashCode method on c1
        System.out.println("HashCode value: "
                           + c1.hashCode());
    }
}

输出：

Class represented by c1: int
HashCode value: 589431969

参考： https://docs.oracle.com/javase/9/docs/api/ Java/lang/Class.html#hashCode–