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Exception in thread "main" java.lang.NoSuchMethodError: main
来源: 互联网 发布时间:2015-10-27
本文导语: 编译: --------------------Configuration: j2sdk1.4.0_02 -------------------- Process completed. 运行: Exception in thread "main" java.lang.NoSuchMethodError: main 系统环境变量设置: classpath=.;D:j2sdk1.4.0_02lib path=D:j2sdk1.4.0_02bin 操作系统:Win2000...
编译:
--------------------Configuration: j2sdk1.4.0_02 --------------------
Process completed.
运行:
Exception in thread "main" java.lang.NoSuchMethodError: main
系统环境变量设置:
classpath=.;D:j2sdk1.4.0_02lib
path=D:j2sdk1.4.0_02bin
操作系统:Win2000 Server
程序名:Clock.java
源程序(安装j2sdk1.4.0_02自带的程序):
/*
* @(#)Clock.java 1.9 01/12/03
*
* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;
/**
* Time!
*
* @author Rachel Gollub
* @modified Daniel Peek replaced circle drawing calculation, few more changes
*/
public class Clock extends Applet implements Runnable {
private volatile Thread timer; // The thread that displays clock
private int lastxs, lastys, lastxm,
lastym, lastxh, lastyh; // Dimensions used to draw hands
private SimpleDateFormat formatter; // Formats the date displayed
private String lastdate; // String to hold date displayed
private Font clockFaceFont; // Font for number display on clock
private Date currentDate; // Used to get date to display
private Color handColor; // Color of main hands and dial
private Color numberColor; // Color of second hand and numbers
public void init() {
int x,y;
lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
formatter = new SimpleDateFormat ("EEE MMM dd hh:mm:ss yyyy",
Locale.getDefault());
currentDate = new Date();
lastdate = formatter.format(currentDate);
clockFaceFont = new Font("Serif", Font.PLAIN, 14);
handColor = Color.blue;
numberColor = Color.darkGray;
try {
setBackground(new Color(Integer.parseInt(getParameter("bgcolor"),
16)));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
try {
handColor = new Color(Integer.parseInt(getParameter("fgcolor1"),
16));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
try {
numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"),
16));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
resize(300,300); // Set clock window size
}
// Paint is the main part of the program
public void paint(Graphics g) {
int xh, yh, xm, ym, xs, ys;
int s = 0, m = 10, h = 10;
int xcenter = 80, ycenter = 55;
String today;
currentDate = new Date();
formatter.applyPattern("s");
try {
s = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
s = 0;
}
formatter.applyPattern("m");
try {
m = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
m = 10;
}
formatter.applyPattern("h");
try {
h = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
h = 10;
}
// Set position of the ends of the hands
xs = (int) (Math.cos(s * Math.PI / 30 - Math.PI / 2) * 45 + xcenter);
ys = (int) (Math.sin(s * Math.PI / 30 - Math.PI / 2) * 45 + ycenter);
xm = (int) (Math.cos(m * Math.PI / 30 - Math.PI / 2) * 40 + xcenter);
ym = (int) (Math.sin(m * Math.PI / 30 - Math.PI / 2) * 40 + ycenter);
xh = (int) (Math.cos((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30
+ xcenter);
yh = (int) (Math.sin((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30
+ ycenter);
// Draw the circle and numbers
g.setFont(clockFaceFont);
g.setColor(handColor);
g.drawArc(xcenter-50, ycenter-50, 100, 100, 0, 360);
g.setColor(numberColor);
g.drawString("9", xcenter-45, ycenter+3);
g.drawString("3", xcenter+40, ycenter+3);
g.drawString("12", xcenter-5, ycenter-37);
g.drawString("6", xcenter-3, ycenter+45);
// Get the date to print at the bottom
formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
today = formatter.format(currentDate);
// Erase if necessary
g.setColor(getBackground());
if (xs != lastxs || ys != lastys) {
g.drawLine(xcenter, ycenter, lastxs, lastys);
g.drawString(lastdate, 5, 125);
}
if (xm != lastxm || ym != lastym) {
g.drawLine(xcenter, ycenter-1, lastxm, lastym);
g.drawLine(xcenter-1, ycenter, lastxm, lastym);
}
if (xh != lastxh || yh != lastyh) {
g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
g.drawLine(xcenter-1, ycenter, lastxh, lastyh);
}
// Draw date and hands
g.setColor(numberColor);
g.drawString(today, 5, 125);
g.drawLine(xcenter, ycenter, xs, ys);
g.setColor(handColor);
g.drawLine(xcenter, ycenter-1, xm, ym);
g.drawLine(xcenter-1, ycenter, xm, ym);
g.drawLine(xcenter, ycenter-1, xh, yh);
g.drawLine(xcenter-1, ycenter, xh, yh);
lastxs = xs; lastys = ys;
lastxm = xm; lastym = ym;
lastxh = xh; lastyh = yh;
lastdate = today;
currentDate = null;
}
public void start() {
timer = new Thread(this);
timer.start();
}
public void stop() {
timer = null;
}
public void run() {
Thread me = Thread.currentThread();
while (timer == me) {
try {
Thread.currentThread().sleep(100);
} catch (InterruptedException e) {
}
repaint();
}
}
public void update(Graphics g) {
paint(g);
}
public String getAppletInfo() {
return "Title: A Clock n"
+ "Author: Rachel Gollub, 1995 n"
+ "An analog clock.";
}
public String[][] getParameterInfo() {
String[][] info = {
{"bgcolor", "hexadecimal RGB number",
"The background color. Default is the color of your browser."},
{"fgcolor1", "hexadecimal RGB number",
"The color of the hands and dial. Default is blue."},
{"fgcolor2", "hexadecimal RGB number",
"The color of the second hand and numbers. Default is dark gray."}
};
return info;
}
}
--------------------Configuration: j2sdk1.4.0_02 --------------------
Process completed.
运行:
Exception in thread "main" java.lang.NoSuchMethodError: main
系统环境变量设置:
classpath=.;D:j2sdk1.4.0_02lib
path=D:j2sdk1.4.0_02bin
操作系统:Win2000 Server
程序名:Clock.java
源程序(安装j2sdk1.4.0_02自带的程序):
/*
* @(#)Clock.java 1.9 01/12/03
*
* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;
/**
* Time!
*
* @author Rachel Gollub
* @modified Daniel Peek replaced circle drawing calculation, few more changes
*/
public class Clock extends Applet implements Runnable {
private volatile Thread timer; // The thread that displays clock
private int lastxs, lastys, lastxm,
lastym, lastxh, lastyh; // Dimensions used to draw hands
private SimpleDateFormat formatter; // Formats the date displayed
private String lastdate; // String to hold date displayed
private Font clockFaceFont; // Font for number display on clock
private Date currentDate; // Used to get date to display
private Color handColor; // Color of main hands and dial
private Color numberColor; // Color of second hand and numbers
public void init() {
int x,y;
lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
formatter = new SimpleDateFormat ("EEE MMM dd hh:mm:ss yyyy",
Locale.getDefault());
currentDate = new Date();
lastdate = formatter.format(currentDate);
clockFaceFont = new Font("Serif", Font.PLAIN, 14);
handColor = Color.blue;
numberColor = Color.darkGray;
try {
setBackground(new Color(Integer.parseInt(getParameter("bgcolor"),
16)));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
try {
handColor = new Color(Integer.parseInt(getParameter("fgcolor1"),
16));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
try {
numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"),
16));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
resize(300,300); // Set clock window size
}
// Paint is the main part of the program
public void paint(Graphics g) {
int xh, yh, xm, ym, xs, ys;
int s = 0, m = 10, h = 10;
int xcenter = 80, ycenter = 55;
String today;
currentDate = new Date();
formatter.applyPattern("s");
try {
s = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
s = 0;
}
formatter.applyPattern("m");
try {
m = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
m = 10;
}
formatter.applyPattern("h");
try {
h = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
h = 10;
}
// Set position of the ends of the hands
xs = (int) (Math.cos(s * Math.PI / 30 - Math.PI / 2) * 45 + xcenter);
ys = (int) (Math.sin(s * Math.PI / 30 - Math.PI / 2) * 45 + ycenter);
xm = (int) (Math.cos(m * Math.PI / 30 - Math.PI / 2) * 40 + xcenter);
ym = (int) (Math.sin(m * Math.PI / 30 - Math.PI / 2) * 40 + ycenter);
xh = (int) (Math.cos((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30
+ xcenter);
yh = (int) (Math.sin((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30
+ ycenter);
// Draw the circle and numbers
g.setFont(clockFaceFont);
g.setColor(handColor);
g.drawArc(xcenter-50, ycenter-50, 100, 100, 0, 360);
g.setColor(numberColor);
g.drawString("9", xcenter-45, ycenter+3);
g.drawString("3", xcenter+40, ycenter+3);
g.drawString("12", xcenter-5, ycenter-37);
g.drawString("6", xcenter-3, ycenter+45);
// Get the date to print at the bottom
formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
today = formatter.format(currentDate);
// Erase if necessary
g.setColor(getBackground());
if (xs != lastxs || ys != lastys) {
g.drawLine(xcenter, ycenter, lastxs, lastys);
g.drawString(lastdate, 5, 125);
}
if (xm != lastxm || ym != lastym) {
g.drawLine(xcenter, ycenter-1, lastxm, lastym);
g.drawLine(xcenter-1, ycenter, lastxm, lastym);
}
if (xh != lastxh || yh != lastyh) {
g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
g.drawLine(xcenter-1, ycenter, lastxh, lastyh);
}
// Draw date and hands
g.setColor(numberColor);
g.drawString(today, 5, 125);
g.drawLine(xcenter, ycenter, xs, ys);
g.setColor(handColor);
g.drawLine(xcenter, ycenter-1, xm, ym);
g.drawLine(xcenter-1, ycenter, xm, ym);
g.drawLine(xcenter, ycenter-1, xh, yh);
g.drawLine(xcenter-1, ycenter, xh, yh);
lastxs = xs; lastys = ys;
lastxm = xm; lastym = ym;
lastxh = xh; lastyh = yh;
lastdate = today;
currentDate = null;
}
public void start() {
timer = new Thread(this);
timer.start();
}
public void stop() {
timer = null;
}
public void run() {
Thread me = Thread.currentThread();
while (timer == me) {
try {
Thread.currentThread().sleep(100);
} catch (InterruptedException e) {
}
repaint();
}
}
public void update(Graphics g) {
paint(g);
}
public String getAppletInfo() {
return "Title: A Clock n"
+ "Author: Rachel Gollub, 1995 n"
+ "An analog clock.";
}
public String[][] getParameterInfo() {
String[][] info = {
{"bgcolor", "hexadecimal RGB number",
"The background color. Default is the color of your browser."},
{"fgcolor1", "hexadecimal RGB number",
"The color of the hands and dial. Default is blue."},
{"fgcolor2", "hexadecimal RGB number",
"The color of the second hand and numbers. Default is dark gray."}
};
return info;
}
}
|
你这是applet,不能用java命令直接运行的。
|
appletviewer
|
把Applet放在Frame测试
或写一个.html文件运行Applet
或写一个.html文件运行Applet
|
.表示当前文件夹
|
.是当前文件夹,就是你的Java Source File所在文件夹。
Applet可以用appletviewer命令来运行,效果要比html好
Applet可以用appletviewer命令来运行,效果要比html好
|
用法: appletviewer [-debug] [-J] [-encoding ] url|file ...
appletviewer 要执行的文件名
appletviewer 要执行的文件名