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Multiple markers at this line - The serializable class HelloWorld does not declare a static final serialVersionUID field of type long - The public type HelloWorld must be defined in its own file - The type HelloWorld is already defined

import java.awt.*; //引入java.awt包中的类

import java.applet.*; //引入java.applet包中的类

public class HelloWorld extends Applet //这里有小错误。不知道什么意思怎么改？

{

public void paint(Graphics g )

{

g.drawString("Hello World!",5,35);

}

Atendu_陈

2015-01-23

源自：Java入门第一季（IDEA工具）升级版

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伊兮尘昔
2015-01-23

把你的整体代码贴一下可以吗？从错误上来看是类不存在或者是转型的时候出的错误

0 回复有任何疑惑可以回复我~

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Java入门第一季（IDEA工具）升级版

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Multiple markers at this line - The serializable class HelloWorld does not declare a static final serialVersionUID field of type long - The public type HelloWorld must be defined in its own file - The type HelloWorld is already defined

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Multiple markers at this line - The serializable class HelloWorld does not declare a static final serialVersionUID field of type long - The public type HelloWorld must be defined in its own file - The type HelloWorld is already defined

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Multiple markers at this line - The serializable class HelloWorld does not declare a static final serialVersionUID field of type long - The public type HelloWorld must be defined in its own file - The type HelloWorld is already defined