java.lang.Class usage

最新推荐文章于 2025-08-15 17:42:04 发布

翻译最新推荐文章于 2025-08-15 17:42:04 发布 · 534 阅读

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本文详细介绍了 java.lang.Class 类的基本概念及其应用场景，通过实例演示了如何利用 Class.forName 方法获取类对象，并创建实例。同时，还提供了 Person 类的具体实现示例。

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definition

The java.lang.Class class instance represent classes and interfaces in a running Java application. It has no public constructor.

example

ClassTest.java

@Test
public void testClassForName() {
    try {
        Class cls = Class.forName("Person");
        Person person = cls.getConstructor(String.class).newInstance("test");
        System.out.println(person.getName());
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (InstantiationException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (SecurityException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Person.java

public class Person {

    private String name = null;

    public Person() {
        this.name = "abc";
    }

    public Person(final String name) {
        this.name = name;
    }

    public String getName() {
        return this.name;
    }
}