Java中的属性 hashCode() 方法和示例

Properties 类的hashCode()方法用于为给定的包含键和值的 Properties 生成 hashCode。

句法：

public int hashCode()

参数：此方法没有参数。

返回：此方法返回给定地图的 hashCode 值。

下面的程序显示了 int hashCode() 方法的实现。

方案一：

// Java code to show the implementation of
// hashCode method
  
import java.util.*;
public class GfG {
  
    // Main method
    public static void main(String[] args)
    {
  
        // Create a properties and add some values
        Properties properties = new Properties();
        properties.put("Pen", 10);
        properties.put("Book", 500);
        properties.put("Clothes", 400);
        properties.put("Mobile", 5000);
  
        // Print Properties details
        System.out.println("Properties: "
                           + properties.toString());
  
        // Getting the hashCode value
        System.out.println("HashCode: "
                           + properties.hashCode());
    }
}

输出：

Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400}
HashCode: 548388082

方案二：

// Java program to demonstrate
// hashCode() method.
  
import java.util.*;
  
public class GFG {
  
    // Main method
    public static void main(String[] args)
    {
  
        // Create a properties and add some values
        Properties properties = new Properties();
  
        properties.put(1, "100RS");
        properties.put(2, "500RS");
        properties.put(3, "1000RS");
  
        // Print Properties details
        System.out.println("Current Properties: "
                           + properties.toString());
  
        // Getting the hashCode value
        System.out.println("HashCode: "
                           + properties.hashCode());
    }
}

输出：

Current Properties: {3=1000RS, 2=500RS, 1=100RS}
HashCode: 1545792714

参考资料：https://docs.oracle.com/javase/9/docs/api/ Java/util/Properties.html#hashCode–