如何在java程序中加上滚动条，为什么我的程序滚动条没显示？

请使用JScroolPane。比如要为一个多行文本域加上滚动条，要使用如下代码：

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jf.add(new JScrollPane(new TextArea(50,30))));

其中jf代表窗口。

java解析lrc文件代码

lrc可以通过如下util工具类进行转换，如果想知道结果是否读取的有问题，可以直接用记事本打开lrc文件的，之后和输出结果比对一下就行。

package com.routon.utils;

import java.io.BufferedReader;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import android.util.Log;

/**

* parse lrc file tool

* eg：

* utilLrc lrc = new utilLrc("/sdcard/test.lrc");

* get song name : String title = lrc.getTitle();

* get performer name : String artist = lrc.getArtist();

* get album name: String album = lrc.getAlbum();

* get lrcmaker name: String lrcMaker = lrc.getLrcMaker();

* get song list: ListStatement list = lrc.getLrcList();

*

* @author xuweilin

*

*/

public class utilLrc {

private static String TAG = "utilLrc";

public class Statement {

private double time = 0.0; //time, 0.01s

private String lyric = ""; //song word

/*

* get time

*/

public double getTime() {

return time;

}

/*

* set time

*/

public void setTime(double time) {

this.time = time;

}

/*

* set time.format:mm:ss.ms

*/

public void setTime(String time) {

String str[] = time.split(":|\\.");

this.time = Integer.parseInt(str[0])*60+Integer.parseInt(str[1])+Integer.parseInt(str[2])*0.01;

}

/*

* get lrc word

*/

public String getLyric() {

return lyric;

}

/*

* set lrc word

*/

public void setLyric(String lyric) {

this.lyric = lyric;

}

}

private BufferedReader bufferReader = null;

private String title = "";

private String artist = "";

private String album = "";

private String lrcMaker = "";

private ListStatement statements = new ArrayListStatement();

/*

*

* fileName

*/

public utilLrc(String fileName) throws IOException{

FileInputStream file = new FileInputStream(fileName);

bufferReader = new BufferedReader(new InputStreamReader(file, "utf-8"));

readData();

}

/*

* read the file

*/

private void readData() throws IOException{

statements.clear();

String strLine;

while(null != (strLine = bufferReader.readLine()))

{

if("".equals(strLine.trim()))

{

continue;

}

if(null == title || "".equals(title.trim()))

{

Pattern pattern = Pattern.compile("\\[ti:(.+?)\\]");

Matcher matcher = pattern.matcher(strLine);

if(matcher.find())

{

title=matcher.group(1);

continue;

}

}

if(null == artist || "".equals(artist.trim()))

{

Pattern pattern = Pattern.compile("\\[ar:(.+?)\\]");

Matcher matcher = pattern.matcher(strLine);

if(matcher.find())

{

artist=matcher.group(1);

continue;

}

}

if(null == album || "".equals(album.trim()))

{

Pattern pattern = Pattern.compile("\\[al:(.+?)\\]");

Matcher matcher = pattern.matcher(strLine);

if(matcher.find())

{

album=matcher.group(1);

continue;

}

}

if(null == lrcMaker || "".equals(lrcMaker.trim()))

{

Pattern pattern = Pattern.compile("\\[by:(.+?)\\]");

Matcher matcher = pattern.matcher(strLine);

if(matcher.find())

{

lrcMaker=matcher.group(1);

continue;

}

}

int timeNum=0;

String str[] = strLine.split("\\]");

for(int i=0; istr.length; ++i)

{

String str2[] = str[i].split("\\[");

str[i] = str2[str2.length-1];

if(isTime(str[i])){

++timeNum;

}

}

for(int i=0; itimeNum;++i)

{

Statement sm = new Statement();

sm.setTime(str[i]);

if(timeNumstr.length)

{

sm.setLyric(str[str.length-1]);

}

statements.add(sm);

}

}

sortLyric();

}

/*

* judge the string is or not date format.

*/

private boolean isTime(String string)

{

String str[] = string.split(":|\\.");

if(3!=str.length)

{

return false;

}

try{

for(int i=0;istr.length;++i)

{

Integer.parseInt(str[i]);

}

}

catch(NumberFormatException e)

{

Log.e(TAG, "isTime exception："+e.getMessage());

return false;

}

return true;

}

/*

* sort the word by time.

*/

private void sortLyric()

{

for(int i=0;istatements.size()-1;++i)

{

int index=i;

double delta=Double.MAX_VALUE;

boolean moveFlag = false;

for(int j=i+1;jstatements.size();++j)

{

double sub;

if(0=(sub=statements.get(i).getTime()-statements.get(j).getTime()))

{

continue;

}

moveFlag=true;

if(subdelta)

{

delta=sub;

index=j+1;

}

}

if(moveFlag)

{

statements.add(index, statements.get(i));

statements.remove(i);

--i;

}

}

}

/**

* get title

* @return

*/

public String getTitle(){

return title;

}

/**

* get artist

* @return

*/

public String getArtist(){

return artist;

}

/**

* get album

* @return

*/

public String getAlbum(){

return album;

}

/**

* get lrc maker

* @return

*/

public String getLrcMaker(){

return lrcMaker;

}

/**

* get song list

* @return

*/

public ListStatement getLrcList(){

return statements;

}

}

如何在java中实现 歌词同步显示

如果你打开歌词文件查看的话,前面都会有时间.我想歌词同步也是靠的这个时间吧

求教，急用！JAVA按歌词文件的时间标签从小到大排列内容，然后最好能给我做个方法，让我直接调用，排

你好，这是你要的方法，直接输入路径调用就可以了，输出结果是sorted-加原文件名

/**

* 根据路径和编码 重新排列歌词中的文件，转换后的文件是“sorted-原文件”

*

* @param source 原文件

*/

public static void sortLyric(String source) {

try {

BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(source), "UTF-8"));

ListString lines = new ArrayListString();

String line;

while ((line = br.readLine()) != null) {

lines.add(line);

}

br.close();

Collections.sort(lines);

BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("sorted-" + source, false), "UTF-8"));

for (String everyLine : lines) {

bw.write(everyLine);

bw.newLine();

bw.flush();

}

bw.close();

} catch (Exception e) {

e.printStackTrace();

}

}

java实现文字循环上下滚动并逐渐放大或缩小

是用java Applet 么？

我试着写了个，估计代码不是很简， 你看看是不是这种效果：坐标自己可以去调整下，名字从上到下移动，从上到中间的时候变大，过了中间逐渐变小，过了底部显示下一个名字，循环显示，题意应该没理解错吧

import java.applet.*;

import java.awt.*;

public class ShowName extends Applet

{

String names[]=new String[]{"luojian","qianhongcheng","fenglingxin","luoxiaojian","wangyin"};

int size=20;

int index =0;

int offsetY=20;

int size1 =size;

int size2 =size-10;

int size3 =size-20;

int name1Y =0+offsetY;

int name2Y =-40+offsetY;

int name3Y =-80+offsetY;

int name1Index =index;

int name2Index =index+1;

int name3Index =index+2;

public void init()

{

resize(400,400);

setVisible(true);

}

public void paint(Graphics g)

{

try

{

checkName("name1Index",name1Y);

checkName("name2Index",name2Y);

checkName("name3Index",name3Y);

String name1 =names[name1Index];

String name2 =names[name2Index];

String name3 =names[name3Index];

name1Y=checkY(name1Y);

name2Y=checkY(name2Y);

name3Y=checkY(name3Y);

size1=checkSize(name1Y,size1);

size2=checkSize(name2Y,size2);

size3=checkSize(name3Y,size3);

Font font1 = new Font(null,Font.PLAIN,size1);

Font font2 = new Font(null,Font.PLAIN,size2);

Font font3 = new Font(null,Font.PLAIN,size3);

g.setFont(font1);

g.drawString(name1, 100, name1Y);

g.setFont(font2);

g.drawString(name2, 100, name2Y);

g.setFont(font3);

g.drawString(name3, 100, name3Y);

Thread.sleep(300);

}

catch(Exception e)

{

e.printStackTrace();

}

repaint();

}

public int checkSize(int p,int psize)

{

if(p200)

psize =psize+10;

if(p200)

psize =psize-10;

if(p=400)

psize =size-20;

return psize;

}

public int checkY(int p)

{

if(p=400)

p=-80;

else

p=p+40;

return p;

}

public void checkName(String nameindex,int p)

{

if(p=400)

{

if(nameindex.equals("name1Index"))

{

if(name1Index4)

name1Index++;

else

name1Index =index;

}

if(nameindex.equals("name2Index"))

{

if(name2Index4)

name2Index++;

else

name2Index =index;

}

if(nameindex.equals("name3Index"))

{

if(name3Index4)

name3Index++;

else

name3Index =index;

}

}

}

}

滚动的小球 java源代码

;

要制造那种效果只需要大约 30 行 Java 代码：

import javax.swing.*;

import java.awt.*;

import java.awt.geom.*;

class RollingBall extends JPanel {

Ellipse2D.Float ball = new Ellipse2D.Float( -100, 100, 50, 50 );

public void paintComponent( Graphics g ) {

super.paintComponent( g );

Graphics2D g2 = ( Graphics2D ) g;

// Draw the ball

g2.fill( ball );

// Draw the rotating ellipse by skewing the Device Space

double angdeg =     // One rotation per ball's travelling over its perimeter

ball.x++ % ( Math.PI * ball.width ) / ( Math.PI * ball.width ) * 360;

g2.rotate( Math.toRadians( angdeg ), ball.getCenterX( ), ball.getCenterY( ) );

g2.scale( .5, 1 );

g2.translate( ball.getCenterX( ), 0 );

g2.setColor( Color.gray );

g2.fill( ball );

}

public void roll( ) throws Exception {

while( true ) {

repaint( );

Thread.sleep( 8 );

}

}

public static void main( String[ ] args ) throws Exception {

JFrame f = new JFrame( );

RollingBall rb = new RollingBall( );

f.setSize( 999, 185 );

f.getContentPane( ).add( rb );

f.setVisible( true );

rb.roll( );

}

}

名称栏目：歌词滚动代码java,音乐歌词滚动
标题链接：http://scgulin.cn/article/hesgpp.html