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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