给段最简单的java代码 让我新手看一下

最简单的java代码肯定就是这个了，如下：

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public class MyFirstApp

{

public static void main(String[] args)

{

System.out.print("Hello world");

}

}

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求java公告栏特效代码

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class Test{

private JFrame frame;

private String scrolledText;

private String str ="滚动文字 Demo";

public static void main(String args[]) {

try{

Test window = new Test();

window.frame.setVisible(true);

}

catch(Exception e){

e.printStackTrace();

}

}

public Test(){

initialize();

}

private void initialize(){

frame.setBounds(100, 100, 500, 375);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JPanel panel = new JPanel();

panel.setBackground(Color.WHITE);

panel.setLayout(new BorderLayout());

frame.getContentPane().add(panel, BorderLayout.NORTH);

final JLabel label = new JLabel();

label.setText("New JLabel");

panel.add(label);

label_scrolledText(label);

frame.addComponentListener(

new ComponentAdapter(){

public void componentResized(ComponentEvent arg0){

label_scrolledText(label);

}

});

}

public void label_scrolledText(JLabel label) {

this.scrolledText = this.str;

label.setText(scrolledText);

FontMetrics metrics = label.getFontMetrics(label.getFont());

int textW = metrics.stringWidth(label.getText());

Dimension frameSize = frame.getSize();

for (int i = 1; i = (frameSize.width - textW) / 3 - 3; i++)

scrolledText += " ";

label.setText(scrolledText);

Thread thread = new Thread(new TextChanger(label));

thread.start();

}

}

java.lang.NullPointerException

at Test.initialize(Test.java:26)

at Test.init(Test.java:23)

at Test.main(Test.java:16)

页面特效:下星星的代码(JAVA代码)

以下的代码就可以，lz自己在*的地方填入星星的图片就可以了

body bgcolor=#ee3300

style

.drop { position: absolute; width: 3; filter: flipV(), flipH(); font-size: 40; color: #ffffff }

/style

script language="javascript"

snow = false; // false-rain; true-snow

snowsym = " * " are the symbols for each

rainsym = " * " can put images here.

howmany = 20 many drops/snowflakes?

/**************Do not need to change anything below***********/

if(snow){sym = snowsym; speed=1; angle=10; drops=howmany}

else{sym = rainsym; speed=30; drops=howmany; angle=6}

movex = -speed/angle; movey = speed; count = 0;

function moverain(){

for(move = 0; move drops; move++){

xx[move]+=movex; yy[move]+=mv[move];

hmm = Math.round(Math.random()*1);

if(xx[move] 0){xx[move] = maxx+10;}

if(yy[move] maxy){yy[move] = 10;}

drop[move].left = xx[move]

drop[move].top = yy[move]+document.body.scrollTop;

}setTimeout('moverain()','1')}

/script

script language="javascript"

if (document.all){

drop = new Array(); xx = new Array(); yy = new Array(); mv = new Array()

ly = "document.all[\'"; st = "\'].style"

for(make = 0; make drops; make++){

document.write('div id="drop'+make+'" class=drop'+sym+'/div');

drop[make] = eval(ly+'drop'+make+st);

maxx = document.body.clientWidth-40

maxy = document.body.clientHeight-40

xx[make] = Math.random()*maxx;

yy[make] = -100-Math.random()*maxy;

drop[make].left = xx[make]

drop[make].top = yy[make]

mv[make] = (Math.random()*5)+speed/16;

drop[make].fontSize = (Math.random()*10)+20;

if(snow){col = 'white'}else{col = 'white'}

drop[make].color = col;

}

window.onload=moverain

}

/script

/body

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