NetBeansによる演習 (19)

progJ.pdf progJ-s.pdf progJ-e.pdf 記事一覧

下記プログラムの実行結果

progJ.pdf の[#68%1] の変更例を progJ-e.pdf に追加しました．

//変更後の App61.java
package myapp;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*; //***
class Fig61 extends JPanel{
  Fig61( ){super( );
    setPreferredSize(new Dimension(300, 200));
    setBackground(Color.WHITE);
    setBorder(new LineBorder(Color.BLUE, 2)); //***
  }
  public void paintComponent(Graphics g){
    super.paintComponent(g);
    g.drawLine(0,0,200,200);
    g.setFont(new Font("ＭＳ ゴシック", 1, 24)); //***
    g.setColor(Color.RED); //***
    g.drawString("Hello", 50, 150);
    g.setColor(Color.YELLOW); //***
    g.fillOval(150, 50, 100, 50); //***
    g.setColor(Color.BLACK); //***
    g.drawOval(150, 50, 100, 50);
    g.clearRect(200, 0, 20, 200); //***
  }
}
public class App61 extends App52 {
  JPanel p1;
  App61( ){
    super( ); setSize(350, 300);
    p1 = new JPanel( );
    Container cp = getContentPane( );
    try{Thread.sleep(3000);}catch(Exception e){ } //***
    tf1.setText("Hello"); //***
    p1.add(new Fig61( )); cp.add(p1);
  }
  public static void main(String[ ] args) {
    EventQueue.invokeLater(new Runnable( ) { //***
      public void run( ) {new App61( );} //***
    }); //***
  }
}
//App52.java
package myapp;
import java.awt.*; import javax.swing.*;
import java.awt.event.*;
class App52 extends App50 implements ActionListener {
  App52( ){super( );
    b1.setText("hello");
    /*------------------------------------
    b1.setText("Dec2Bin");
    tf1.setText("123");
    ------------------------------------*/
    b1.addActionListener(this);
  }
  public void actionPerformed(ActionEvent e) {
    String s = tf1.getText( );
    tf1.setText("Hello, " + s);
    /*------------------------------------
    int m, n = 0;
    try{n = Integer.parseInt(s); s = "";}
    catch(Exception ex){n = -1;}
    if(n < 0){tf1.setText("?"); return;}
    for(m = 1; m     while(m > 1){
      m /= 2;
      if(n >= m){s = s + "1"; n = n - m;}
      else{s = s + "0";}
    }
    tf1.setText(s);
    ------------------------------------*/
  }
  public static void main(String[ ] args) {
    new App52( );
  }
}
//App50.java
package myapp;
import java.awt.*; import javax.swing.*;
class App50 extends JFrame implements Runnable {
  JTextField tf1; JButton b1;
  App50( ){super("myApp");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(250, 105);
    setLayout(new FlowLayout( ));
    tf1 = new JTextField("tf1", 20);
    b1 = new JButton("b1");
    Container f0 = getContentPane( );
    f0.add(tf1); f0.add(b1);
    setVisible(true);
  }
  public void run( ){ }
  public static void main(String[ ] args) {
    App50 app = new App50( );
  }
}