instanceof is a binary operator in Java, similar to operators such as ==, >, <.
instanceof is a reserved keyword of Java. Its function is to test whether the object on its left is an instance of the class on its right and return a boolean data type.
The following example creates the displayObjectClass() method to demonstrate the usage of Java instanceOf keyword:
/*
author by w3cschool.cc
Main.java
*/import java.util.ArrayList;import java.util.Vector;public class Main {public static void main(String[] args) {
Object testObject = new ArrayList();
displayObjectClass(testObject);
}
public static void displayObjectClass(Object o) {
if (o instanceof Vector)
System.out.println("对象是 java.util.Vector 类的实例");
else if (o instanceof ArrayList)
System.out.println("对象是 java.util.ArrayList 类的实例");
else
System.out.println("对象是 " + o.getClass() + " 类的实例");
}}The output result of running the above code is:
对象是 java.util.ArrayList 类的实例
The above is the Java instance-instanceOf key For more information on word usage, please pay attention to the PHP Chinese website (www.php.cn)!
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