小编use*_*050的帖子

查看此代码的朋友不知道为什么我无法设置JPanel的大小....

import java.io.*;
import java.util.*;
import java.sql.*;
//import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/*<applet code="k" height=400 width=400></applet>*/
public class k extends JApplet implements ActionListener
{
    JButton b,tinfo;
    JLabel l1,l2;
    JTextField f1,f2;
    JPanel p1;
    CardLayout c1;
    public void init()
    {
        b=new JButton("submit");

        f1=new JTextField(20);      
        f2=new JTextField(20);
        l1=new JLabel("username");
        l2=new JLabel("password");
        p1=new JPanel();
        c1=new CardLayout();
        add(l1);
        add(f1);
        add(l2);
        add(f2);
        add(b);
        add(p1);
        setLayout(new FlowLayout());
        b.addActionListener(this);

    }
    public void actionPerformed(ActionEvent ae)
    {
        //Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        //Connection con=DriverManager.getConnection("jdbc:odbc:mohit:","system","rock");
        try
        {
            Properties p=new Properties();
            p.load(new FileInputStream("mohu.properties")); …

你能告诉我在这个程序中我做错了吗？

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/*<Applet code="kk" height=400 width=400></applet>*/
public class kk extends Applet implements ActionListener
{
    Button b;
    TextField t;
    String str1,str2;
    public void init()
    {
        b=new Button("submit");
        t=new TextField(20);
        add(t);
        add(b);
        b.addActionListener(this);
    }
    public void actionPerformed(ActionEvent ae)
    {
        try
        {
            str2="mohit";
            str1=t.getText();
            if(str1==str2)
            {
                System.out.println("matched");
            }
            else
            {
                System.out.println("not matched");
            }
        }
        catch(Exception e)
        {
            System.out.println("Exception caught ");
        }
    }
}

不知道为什么str1和str2不匹配.

我做了一个录音程序......检查一下.

import java.io.*;
import javax.sound.sampled.*;
public class pp extends Thread
{
    TargetDataLine tdl;
    AudioFileFormat.Type afft;
    AudioInputStream ais;
    File f1;
    public pp(TargetDataLine l,AudioFileFormat.Type t,File f2)
    {
        tdl=l;
        ais=new AudioInputStream(tdl);
        t=afft;
        f1=f2;
    }
    public void start()
    {
        tdl.start();
        super.start();
    }
    public void sr()
    {
        tdl.stop();
        tdl.close();
    }
    public void run()
    {
        try
        {
            AudioSystem.write(ais,afft,f1);
        }
        catch(Exception e)
        {
            e.printStackTrace();
            System.out.println("Exception caught ");
        }
    }
        public static void main(String args[])
        {
            String s=args[0];
            File f=new File(s);
            AudioFormat ff=new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,44100.0F, 16, 2, 4, 44100.0F, …