Java 中的 Class isInstance()方法，示例
原文:https://www . geesforgeks . org/class-is instance-method-in-Java-with-examples/
java.lang.Class 类 的 isInstance() 方法用于检查指定的对象是否兼容，以分配给该类的实例。如果指定的对象为非空，并且可以转换为此类的实例，则方法返回 true。否则返回 false。
语法:
public boolean isInstance(Object object)
参数:该方法接受对象作为参数，该参数是要检查与该类实例兼容性的指定对象。
返回值:如果指定的对象为非空，并且可以转换为此类的实例，则此方法返回 true 。否则返回假。
下面的程序演示了 isInstance()方法。
例 1:
// Java program to demonstrate isInstance() method
public class Test {
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object for this class
Class myClass = Class.forName("Test");
System.out.println("Class represented by myClass: "
+ myClass.toString());
// get the Class instance using forName() method
Class c = Class.forName("java.lang.String");
System.out.println("Class represented by c: "
+ c.toString());
// Check if object c is compatible
// using isInstance() method
System.out.println("Is c compatible: "
+ myClass.isInstance(c));
}
}
输出:
Class represented by myClass: class Test
Class represented by c: class java.lang.String
Is c compatible: false
例 2:
// Java program to demonstrate isInstance() method
public class Test {
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object for this class
Class myClass = Class.forName("Test");
System.out.println("Class represented by myClass: "
+ myClass.toString());
// get the Class instance using forName() method
Class c = Class.forName("Test");
System.out.println("Class represented by c: "
+ c.toString());
// Check if object c is compatible
// using isInstance() method
System.out.println("Is c compatible: "
+ myClass.isInstance(c));
}
}
输出:
Class represented by myClass: class Test
Class represented by c: class Test
Is c compatible: false
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