用示例在Java中打包 hashCode() 方法

Java.lang.Package 类的hashCode()方法用于获取该包实例的 hashCode 值。该方法将 hashCode 值作为整数值返回。
句法：

public int hashCode()

参数：此方法不接受任何参数。
返回值：此方法将 hashCode 值作为整数值返回。
下面的程序演示了 hashCode() 方法。
示例 1：

Java

// Java program to demonstrate
// hashCode() method
 
public class Test {
    public static void main(String[] args)
    {
 
        // returns the Package
        // object for this package
        Package myPackage
            = Package.getPackage("java.lang");
 
        System.out.println(
            "Package represented by myPackage: "
            + myPackage.toString());
 
        // get the hashCode value of this package
        // using hashCode() method
        System.out.println(
            "hashCode value: "
            + myPackage.hashCode());
    }
}

输出：

Package represented by myPackage: package java.lang, Java Platform API Specification, version 1.8
hashCode value: -888658374

示例 2：

Java

// Java program to demonstrate
// hashCode() method
 
public class Test {
    public static void main(String[] args)
    {
 
        // returns the Package
        // object for this package
        Package myPackage
            = Package.getPackage("java.io");
 
        System.out.println(
            "Package represented by myPackage: "
            + myPackage.toString());
 
        // get the hashCode value of this package
        // using hashCode() method
        System.out.println(
            "hashCode value: "
            + myPackage.hashCode());
    }
}

输出：

Package represented by myPackage: package java.io, Java Platform API Specification, version 1.8
hashCode value: -1819917198

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