2011/04/29 public 建構子

Java 系列電子書

http://www.rgagnon.com/javadetails/java-0144.html

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// with event

//Swing, JButton類別 有ActionListener

//Swing, JButton類別

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class SwingEightPuzzleEvent extends JFrame implements ActionListener

{

//static JFrame myfrm=new JFrame("JButton class"); // Java Class JFrame

//static AwtTestEvent myfrm=new AwtTestEvent("JFrame 1 "); // Java Class JFrame

static JTextField tbx1=new JTextField(2); // 建立1文字方塊物件

static JButton buttons[]=new JButton[10];

static JLabel labels[]=new JLabel [10];

public SwingEightPuzzleEvent()

{







}










public static void main(String args[])

{

SwingEightPuzzleEvent myfrm=new SwingEightPuzzleEvent();

String numbers[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8"};

FlowLayout flow=new FlowLayout();

GridLayout grid12= new GridLayout(1,2);

GridLayout grid33= new GridLayout(3,3);

myfrm.setLayout(grid12);

myfrm.setSize(450,450);

JPanel p1 = new JPanel(grid33); //實作 panel 1

for (int i = 0; i < numbers.length; i++)

{

buttons[i] = new JButton(numbers[i]); // create buttons

p1.add(buttons[i], grid33); // 在 panel 1內加入按鈕陣列

}







myfrm.add(p1); // 在視窗myfrm 內加入 panel 1

JPanel p3 = new JPanel(grid33); //實作 panel 3

for (int i = 0; i < numbers.length; i++)

{

labels[i] = new JLabel(); // create labels

p3.add(labels[i], grid33); // 在 panel 1內加入按鈕陣列

}

myfrm.add(p3); // 在視窗myfrm 內加入 panel 3




JPanel p2 = new JPanel(flow); //實作 panel 2

JButton btn1=new JButton("JButton 1"); // 建立按鈕物件 btn1

btn1.addActionListener(myfrm);

p2.add(tbx1); // 在 panel 2內加入文字方塊

p2.add(btn1); // 在 panel 2內加入按鈕




myfrm.add(p2); // 在視窗myfrm 內加入 panel 2













myfrm.setVisible(true);

}




public void actionPerformed(ActionEvent e)

{

String numbers[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8"};

//int rndno;

//String stringValue;

//stringValue=tbx1.getText();

//int intValue = Integer.parseInt(stringValue);

//System.out.println(intValue);

//labels[intValue].setText(stringValue);




/*

for (int j = 0; j < 9; j++)

{

//rndno=(int) (Math.random()*9);

//System.out.println(rndno);

//numbers[i]=String.valueOf(rndno);

//buttons[i].setLabel(numbers[i]);

}

*/




//tbx1.setText(numbers[0]);

//buttons[rndno].setBackground(Color.blue);

//labels[rndno].setText(numbers[0]);

}

}
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整理好後
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// with event
//Swing, JButton類別 有ActionListener
//Swing, JButton類別
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SwingEightPuzzleEvent extends JFrame implements ActionListener
{
//static JFrame myfrm=new JFrame("JButton class"); // Java Class JFrame
//static AwtTestEvent myfrm=new AwtTestEvent("JFrame 1 "); // Java Class JFrame
static JTextField tbx1=new JTextField(2); // 建立1文字方塊物件
static JButton buttons[]=new JButton[10];
static JLabel  labels[]=new JLabel [10];
static String numbers[]  = {"0", "1", "2", "3", "4", "5", "6", "7", "8"};
static FlowLayout flow=new FlowLayout();
static GridLayout grid12= new GridLayout(1,2);
static GridLayout grid33= new GridLayout(3,3);
static JPanel p1 = new JPanel(grid33); //實作  panel 1
static JPanel p2 = new JPanel(flow); //實作  panel 2
static JPanel p3 = new JPanel(grid33); //實作  panel 3
static JButton btn1=new JButton("JButton 1"); // 建立按鈕物件 btn1

public SwingEightPuzzleEvent()
{
for (int i = 0; i < numbers.length; i++)
{
buttons[i] = new JButton(numbers[i]); // create buttons
p1.add(buttons[i], grid33); // 在 panel 1內加入按鈕陣列
}
for (int i = 0; i < numbers.length; i++)
{
labels[i] = new JLabel(); // create labels
p3.add(labels[i], grid33); // 在 panel 1內加入按鈕陣列
}
for (int i = 0; i < numbers.length; i++)
{
labels[i] = new JLabel(); // create labels
p3.add(labels[i], grid33); // 在 panel 1內加入按鈕陣列
}
p2.add(tbx1); // 在 panel 2內加入文字方塊
p2.add(btn1); // 在 panel 2內加入按鈕

}
public static void main(String args[])
{
SwingEightPuzzleEvent myfrm=new SwingEightPuzzleEvent();
myfrm.setLayout(grid12);
myfrm.setSize(450,450);
myfrm.add(p1); // 在視窗myfrm 內加入 panel 1
myfrm.add(p3); // 在視窗myfrm 內加入 panel 3
btn1.addActionListener(myfrm);
myfrm.add(p2); // 在視窗myfrm 內加入 panel 2
myfrm.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
String numbers[]  = {"0", "1", "2", "3", "4", "5", "6", "7", "8"};
//int rndno;
//String stringValue;
//stringValue=tbx1.getText();
//int intValue = Integer.parseInt(stringValue);
//System.out.println(intValue);
//labels[intValue].setText(stringValue);
/*
for (int j = 0; j < 9; j++)
{
//rndno=(int) (Math.random()*9);
//System.out.println(rndno);
//numbers[i]=String.valueOf(rndno);
//buttons[i].setLabel(numbers[i]);
}
*/
//tbx1.setText(numbers[0]);
//buttons[rndno].setBackground(Color.blue);
//labels[rndno].setText(numbers[0]);
}
}

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class Object1 {
public static void main(String args[]) {
Person1 p1, p2;
p1 = new Person1("大雄", 50);
p2 = new Person1("胖虎", 80);
p1.checkWeight();
p2.checkWeight();
p2.weight = 68;
p1.checkWeight();
p2.checkWeight();
}
}






class Person1 {
String name;
int weight;

Person1(String pName, int pWeight) {
name = pName;
weight = pWeight;
}

void checkWeight() {
System.out.print(name+"體重 "+weight+" 公斤,");
if (weight < 70)
System.out.println("很苗條!");
else
System.out.println("很穩重!");
}
}



class Person1 {
String name;
int weight;

Person1(String pName, int pWeight) {
name = pName;
weight = pWeight;
}

void checkWeight() {
System.out.print(name+"體重 "+weight+" 公斤,");
if (weight < 70)
System.out.println("很苗條!");
else
System.out.println("很穩重!");
}
}
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