Java System identityHashCode()用法及代碼示例

Java System 類的 identityHashCode() 方法返回指定對象的哈希碼。它由默認方法 hashCode() 返回。

用法

public static int identityHashCode (Object x)

參數

x- 要為其計算 hashCode 的對象

返回哈希碼。
如果哈希碼為空，則返回零作為參考。

例子1

public class SystemIdentityHashCodeExample1{
    public static void main(String[] args) {
        int a=10;
         System.out.println("identity hash code of object a = "+System.identityHashCode(a));
         int b=10;
         System.out.println("identity hash code of object b = "+System.identityHashCode(b));
         int c=01;
         System.out.println("identity hash code of object c = "+System.identityHashCode(c));
    }
}

輸出：

identity hash code of object a = 743673026
identity hash code of object b = 743673026
identity hash code of object c = 557722442

例子2

public class SystemIdentityHashCodeExample2{
    public static void main(String[] args) {
        String a=new String ();
        a.equals("Shubham");
         System.out.println("identity hash code of object a = "+System.identityHashCode(a));
         String b=new String ();
            b.equals("Jadon");
             System.out.println("identity hash code of object b = "+System.identityHashCode(b));	
    }
}

輸出：

identity hash code of object a = 843730481
identity hash code of object b = 743673026

相關用法

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