两个问题
1)当将java项目导出为JAR文件时,应用程序如何知道首先运行包中的哪个Class?我的应用程序特别要求 userInterface.java 文件在 CommonDenom.java 文件之前运行。
2) 运行 java 文件时,我收到一条错误消息,显示“无法启动 Java JAR 文件“commonDenom.jar”。请检查控制台以获取可能的消息。”
我从哪里开始解决这个问题?我检查了控制台,但在弹出错误消息时它似乎没有注册任何内容。
package commonDenom;
import java.util.Arrays;
import java.util.Scanner;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class UserInterface {
Shell shell;
Button btnNext;
Button btnDone;
Text input;
Text output;
static int count;
static int[] finalNums;
int[] nums = new int[1000];
public static void main(String[] args){
Display display = new Display();
new UserInterface(display);
display.dispose();
}
public UserInterface(Display display){
shell = new Shell(display);
shell.setSize(220,350);
shell.open();
input = new Text(shell, SWT.SINGLE);
input.setBounds(10, 10, 100, 20);
btnNext = new Button(shell, SWT.PUSH);
btnNext.setBounds(10, 40, 100, 30);
btnNext.setText("Next");
nextPress();
btnDone = new Button(shell, SWT.PUSH);
btnDone.setBounds(10, 80, 100, 30);
btnDone.setText("Done");
donePress();
output = new Text(shell, SWT.SINGLE);
output.setBounds(10, 120, 200, 200);
while(!shell.isDisposed()){
if(!display.readAndDispatch()){
display.sleep();
}
}
}
public void nextPress(){
btnNext.addSelectionListener(new SelectionAdapter(){
int x = 0;
@Override
public void widgetSelected(SelectionEvent e) {
nums[x] = Integer.parseInt(input.getText());
System.out.println("nums[" + x + "]:" + nums[x]);
x++;
count++;
}
});
}
public void donePress(){
btnDone.addSelectionListener(new SelectionAdapter(){
@Override
public void widgetSelected(SelectionEvent e) {
finalNums = new int[count];
for(int i = 0; i < count; i++){
finalNums[i] = nums[i];
}
System.out.println("finalNums:" + Arrays.toString(finalNums));
commonDenom.compare();
if(commonDenom.getResult() == 0){
output.setText(Arrays.toString(finalNums) + "\nThese numbers do not have a \ncommon multiplier");
}
else{
output.setText(Arrays.toString(finalNums) + "\nResult:" + String.valueOf(commonDenom.getResult()));
}
}
});
}
public static int[] getNums(){
return finalNums;
}
}
Manifest.txt 位置:/Dropbox/workspace/commonDenom/bin
类位置:/Dropbox/workspace/commonDenom/bin/commonDenom/
班级名称:
commonDenom.class
UserInterface.class
UserInterface$1.class (I didn't create this)
UserInterface$2.class (I didn't create this)
Manifest.txt 内容(带有两个尾随空行):
Main-Class: commonDenom.UserInterface
jar tf CommonDenom.jar 返回以下内容:
META-INF/
META-INF/MANIFEST.MF
Manifest.txt
commonDenom/
commonDenom/commonDenom.class
commonDenom/UserInterface$1.class
commonDenom/UserInterface$2.class
commonDenom/UserInterface.class