wcl.java

1 创建一个方法

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class wcl extends JFrame 
{   
    public wcl(String s)
    {
       super(s);
    }
   public static void main(String args[])
   {
   //JPanel j=new JPanel();
   JPanel jp1,jp2,jp3,jp4,jp5,jp6;
   wcl y=new wcl("wcl's frame");
   JButton b1=new JButton("输出*矩阵");
   JButton b2=new JButton("判断大小写");
   JButton b3=new JButton("四数排序");
   JButton b4=new JButton("最大矩阵元素");
   JButton b5=new JButton("50以内偶数");
       jp1=new JPanel();jp1.setBackground(Color.red);
    jp2=new JPanel();jp2.setBackground(Color.yellow);
    jp3=new JPanel();jp3.setBackground(Color.yellow);
    jp4=new JPanel();jp4.setBackground(Color.pink);
    jp5=new JPanel();jp5.setBackground(Color.pink);
    jp6=new JPanel();jp6.setBackground(Color.pink);
     y.add(jp1);
     y.add(jp2);
     y.add(jp3);
     y.add(jp4);
     y.add(jp5);
      jp1.add(b1);
      jp2.add(b2);
      jp3.add(b3);
      jp4.add(b4);
      jp5.add(b5);
   JMenuBar m=new JMenuBar();
            y.setJMenuBar(m);
   JMenu mw=new JMenu("File");
   JMenu mw2=new JMenu("Edit");
        m.add(mw);
        m.add(mw2);
   JMenuItem mi1=new JMenuItem("NewF");
   JMenuItem mi2=new JMenuItem("OpenF");
             mw.add(mi1);
             mw.add(mi2);
       //y.getContentPane().add(j);
        y.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        y.setLayout(new GridLayout(3,2));
        jp6.setLayout(new FlowLayout(0));
        y.setVisible(true);
        y.setSize(300,300);

   b1.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e)
   {
           x1 m1=new x1();
           m1.k1();
   }
   }); 

    b2.addMouseListener(new MouseAdapter(){
    public void mouseClicked(MouseEvent em)
    {
           x2 m2=new x2();
           m2.k2();
    }
   }); 
    b3.addMouseListener(new MouseAdapter(){
    public void mouseReleased(MouseEvent em)
    {
           x3 m3=new x3();
           m3.k3();
    }
   }); 

    b4.addMouseListener(new MouseAdapter(){
    public void mouseReleased(MouseEvent em)
    {   
           x4 m4=new x4();
           m4.k4();
    }
   }); 

    b5.addMouseListener(new MouseAdapter(){
    public void mouseReleased(MouseEvent em)
    {   
           x5 m5=new x5();
           m5.k5();
    }
   });
   
  


}
}

class x1{
     void k1(){
         try{
         int a1;
         String str;
         BufferedReader buf;
         buf=new BufferedReader(new InputStreamReader(System.in));
         System.out.print("请输入一个整数：");
         str=buf.readLine();
         a1=Integer.parseInt(str);
         for(int i=1;i<=a1;i++)
         {
             for(int j=1;j<=a1;j++)
             System.out.print(" *");
             System.out.println();
}
}catch(IOException e){}
}
}

class x2{
    void k2()
    {
        char r=' ';
        System.out.print("请输入要鉴别的英文字母:");
        try{
            r=(char)(System.in.read());
        }
        catch(IOException hu){ }
        if(r>='A'&&r<'a')
        {
            System.out.println("大写"+"\n");
        }
        else if(r<='z'&&r>'Z')
        {
            System.out.println("小写"+"\n");
        }
        else
        {
            System.out.println("您输的不是英文字母!!!!"+"\n");
        }
    }
}

class x3{
    void k3(){
        try{
        int m,n,p,q,t;
        String str;
         BufferedReader buf;
         buf=new BufferedReader(new InputStreamReader(System.in));
          System.out.print("请输入第一个数字：");
           str=buf.readLine();
            m=Integer.parseInt(str);
          System.out.print("请输入第二个数字：");
           str=buf.readLine();
            n=Integer.parseInt(str);
          System.out.print("请输入第三个数字：");
           str=buf.readLine();
            p=Integer.parseInt(str);
          System.out.print("请输入第四个数字：");
           str=buf.readLine();
            q=Integer.parseInt(str);
        if(m>n)
             {t=m;m=n;n=t;}
        if(m>p)
             {t=m;m=p;p=t;}
        if(m>q)
             {t=m;m=q;q=t;}
        if(n>p)
             {t=n;n=p;p=t;}
        if(n>q)
             {t=n;n=q;q=t;}
        if(p>q)
             {t=p;p=q;q=t;}
        System.out.println("从小到大的排列为：");
        System.out.print(m+","+n+","+p+","+q+"\n");
    }catch(IOException e){}
}
}

class x4{
    void k4(){
        int max;
        int r[][]={{8,10,5,6},{30,13,27,11},{19,100,0,3}};
        max=r[0][0];
        System.out.println("最大的元素的值是：");
         for(int i=0;i<3;i++)
          for(int j=0;j<2;j++){
           if(r[i][j]>max){
            max=r[i][j];
            }
        }
        System.out.println("最大元素是："+max+"\n");
    }
}

class x5{
    void k5(){
        int i,j;
        System.out.println("50以内的整数是：");
        for(i=0;i<=50;i++)
        {
            if(i%2==0)
            {
                System.out.print(i+" ");
            }
        }
        System.out.println();
    }   
}