Java Package hashCode()用法及代碼示例

java.lang.Package類的hashCode()方法用於獲取此包實例的hashCode值。該方法將hashCode值返回為整數值。

用法:

public int hashCode()

參數：此方法不接受任何參數。

返回值：此方法將hashCode值返回為整數值。

下麵的程序演示了hashCode()方法。

範例1：

// 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()); 
    } 
}

輸出：

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

範例2：

// 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()); 
    } 
}

輸出：

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

參考： https://docs.oracle.com/javase/9/docs/api/java/lang/Package.html#hashCode-

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