constructortroubleaccess.java

来自「JAVA 工作指南 可以说是程序员必备的东西哦」· Java 代码 · 共 29 行

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

class Deny {
    private Deny() {
	System.out.format("Deny constructor%n");
    }
}

public class ConstructorTroubleAccess {
    public static void main(String... args) {
	try {
	    Constructor c = Deny.class.getDeclaredConstructor();
//  	    c.setAccessible(true);   // solution
	    c.newInstance();

        // production code should handle these exceptions more gracefully
	} catch (InvocationTargetException x) {
	    x.printStackTrace();
	} catch (NoSuchMethodException x) {
	    x.printStackTrace();
	} catch (InstantiationException x) {
	    x.printStackTrace();
	} catch (IllegalAccessException x) {
	    x.printStackTrace();
	}
    }
}