系统类identityHashCode()方法 (System class identityHashCode() method)
identityHashCode() method is available in java.lang package.
identityHashCode()方法在java.lang包中可用。
identityHashCode() method is used to return the hashcode of the given object – By using this method the value of hashcode will be the same as the value of hashcode by using hashCode() method.
identityHashCode()方法用于返回给定对象的哈希码–通过使用此方法，哈希码的值将与使用hashCode()方法的哈希码的值相同。
Let suppose, if we pass an object that holds null value then in that case, the value of hashCode will be 0.
假设，如果我们传递一个持有null值的对象，则在这种情况下，hashCode的值将为0 。
identityHashCode() method is a static method so this method is accessible with the class name too.
identityHashCode()方法是静态方法，因此也可以使用类名访问此方法。
identityHashCode() method does not throw any exception.
identityHashCode()方法不会引发任何异常。
Syntax:
句法：
public static int identityHashCode(Object obj);
Parameter(s):
参数：
obj – represent the object for which the hashcode is to be returned.
obj –代表要为其返回哈希码的对象。
Return value:
返回值：
The return type of this method is int, it returns the hashcode of the given argument.
此方法的返回类型为int ，它返回给定参数的哈希码。
Example:
例：
// Java program to demonstrate the example of
// identityHashCode () method of System Class
import java.lang.*;
import java.io.*;
public class IdentityHashCodeMethod {
public static void main(String[] args) throws Exception {
File file1 = new File("Java");
File file2 = new File("Programming");
// getting hashcode
int hcode1 = System.identityHashCode(file1);
System.out.println(hcode1);
// getting hashcode
int hcode2 = System.identityHashCode(file2);
System.out.println(hcode2);
}
}
Output
输出量
E:\Programs>javac IdentityHashCodeMethod.java
E:\Programs>java IdentityHashCodeMethod
1018081122
242131142
翻译自: https://www.includehelp.com/java/system-class-identityhashcode-method-with-example.aspx