问题
I got 5 JTextareas that stand for output for the sorting I need help regarding displaying or appending iteration in each JTextArea to show the algorithm of sorting.
I have got values of { 5,3,9,7,1,8 }
JTextArea1 |3, 5, 7, 1, 8, 9|
JTextArea2 |3, 5, 1, 7, 8, 9|
JTextArea3 |3, 5, 1, 7, 8, 9|
JTextArea4 |1, 3, 5, 7, 8, 9|
JTextArea5 |1, 3, 5, 7, 8, 9|
My problem is how can I append those values in each textarea.
My code is too long, I'm sorry for that.
My code is not finished yet. I just ended on the button of ascbubble but it can run.
//importing needed packages
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Sorting extends JPanel
{
// String needed to contain the values then convert into int
int int1,int2,int3,int4,int5,temp;
String str1,str2,str3,str4,str5;
//Buttons needed
JButton ascbubble,descbubble,
ascballoon,descballoon,
clear;
//Output Area of the result sorting
JTextArea output1,output2,
output3,output4,
output5;
//Text Field for user to input numbers
JTextField input1,input2,
input3,input4,
input5;
Sorting()
{
//set color of the background
setBackground(Color.black);
//initialize JButton,JTextArea and JTextField
//JButton
ascbubble = new JButton("Ascending Bubble");
descbubble = new JButton("Descending Bubble");
ascballoon = new JButton("Ascending Balloon");
descballoon = new JButton("Descending Balloon");
clear = new JButton("Clear");
//JTextArea
output1 = new JTextArea(" ");
output2 = new JTextArea(" ");
output3 = new JTextArea(" ");
output4 = new JTextArea(" ");
output5 = new JTextArea(" ");
//JTextField
input1 = new JTextField("00");
input2 = new JTextField("00");
input3 = new JTextField("00");
input4 = new JTextField("00");
input5 = new JTextField("00");
//SetBounds
setLayout(null);
input1.setBounds(120, 50, 30, 20);
input2.setBounds(170, 50, 30, 20);
input3.setBounds(220, 50, 30, 20);
input4.setBounds(270, 50, 30, 20);
input5.setBounds(320, 50, 30, 20);
ascbubble.setBounds(50, 120, 150, 40);
descbubble.setBounds(50, 180, 150, 40);
clear.setBounds(210, 140, 100, 50);
ascballoon.setBounds(320, 120, 150, 40);
descballoon.setBounds(320, 180, 150, 40);
output1.setBounds(20, 300, 80, 100);
output2.setBounds(120, 300, 80, 100);
output3.setBounds(220, 300, 80, 100);
output4.setBounds(320, 300, 80, 100);
output5.setBounds(420, 300, 80, 100);
//add function to the buttons
thehandler handler = new thehandler();
ascbubble.addActionListener(handler);
descbubble.addActionListener(handler);
ascballoon.addActionListener(handler);
descballoon.addActionListener(handler);
//add to the frame
add(input1);
add(input2);
add(input3);
add(input4);
add(input5);
add(output1);
add(output2);
add(output3);
add(output4);
add(output5);
add(ascbubble);
add(descbubble);
add(ascballoon);
add(descballoon);
add(clear);
}
private class thehandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==ascbubble)
{
//input1
str1=input1.getText();
int1=Integer.parseInt(str1);
//input2
str2=input2.getText();
int2=Integer.parseInt(str2);
//input3
str3=input3.getText();
int3=Integer.parseInt(str3);
//input4
str4=input4.getText();
int4=Integer.parseInt(str4);
//input5
str5=input5.getText();
int5=Integer.parseInt(str5);
int contain[]={int1,int2,int3,int4,int5};
//formula for Buble Sort Ascending Order
for ( int pass = 1; pass < contain.length; pass++ )
{
for ( int i = 0; i < contain.length - pass; i++ )
{
if ( contain[ i ] > contain[ i + 1 ] )
{
temp = contain[ i ];
contain[ i ] = contain[ i + 1 ];
contain[ i + 1 ] = temp;
}
}
}
}
}
}
public static void main(String[]args)
{
JFrame frame = new JFrame("Sorting");
frame.add(new Sorting());
frame.setSize(550, 500);
frame.setVisible(true);
}
}
回答1:
First of all, JTextArea has a simple append method, so you only need one. On each pass, you simply need to generate a new String which represents the current state of the array
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.StringJoiner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Sort {
public static void main(String[] args) {
new Sort();
}
public Sort() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField fieldValues;
private JTextArea fieldResults;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.insets = new Insets(2, 2, 2, 2);
fieldValues = new JTextField(20);
fieldResults = new JTextArea(10, 20);
add(fieldValues, gbc);
JButton btn = new JButton("Sort");
add(btn, gbc);
add(new JScrollPane(fieldResults), gbc);
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String[] values = fieldValues.getText().split(",");
int[] contain = new int[values.length];
for (int index = 0; index < values.length; index++) {
contain[index] = Integer.parseInt(values[index].trim());
}
for (int pass = 1; pass < contain.length; pass++) {
for (int i = 0; i < contain.length - pass; i++) {
if (contain[i] > contain[i + 1]) {
int temp = contain[i];
contain[i] = contain[i + 1];
contain[i + 1] = temp;
StringJoiner sj = new StringJoiner(", ", "", "\n");
for (int value : contain) {
sj.add(Integer.toString(value));
}
fieldResults.append(sj.toString());
}
}
}
}
});
}
}
}
Now, the problem with this is, the larger the dataset, the more time it will take to sort, this will mean the UI will pause until the sort is completed
One solution would be to use a SwingWorker, for example...
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;
import java.util.StringJoiner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Sort {
public static void main(String[] args) {
new Sort();
}
public Sort() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField fieldValues;
private JTextArea fieldResults;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.insets = new Insets(2, 2, 2, 2);
fieldValues = new JTextField(20);
fieldResults = new JTextArea(10, 20);
add(fieldValues, gbc);
JButton btn = new JButton("Sort");
add(btn, gbc);
add(new JScrollPane(fieldResults), gbc);
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
btn.setEnabled(false);
String text = fieldValues.getText();
SortWorker worker = new SortWorker(text);
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
String name = evt.getPropertyName();
if ("state".equals(name)) {
if (worker.getState() == SwingWorker.StateValue.DONE) {
btn.setEnabled(true);
}
}
}
});
worker.execute();
}
});
}
public class SortWorker extends SwingWorker<int[], String> {
private String text;
public SortWorker(String text) {
this.text = text;
}
@Override
protected void process(List<String> chunks) {
for (String value : chunks) {
fieldResults.append(value);
}
}
@Override
protected int[] doInBackground() throws Exception {
String[] values = text.split(",");
int[] contain = new int[values.length];
for (int index = 0; index < values.length; index++) {
contain[index] = Integer.parseInt(values[index].trim());
}
for (int pass = 1; pass < contain.length; pass++) {
for (int i = 0; i < contain.length - pass; i++) {
if (contain[i] > contain[i + 1]) {
int temp = contain[i];
contain[i] = contain[i + 1];
contain[i + 1] = temp;
StringJoiner sj = new StringJoiner(", ", "", "\n");
for (int value : contain) {
sj.add(Integer.toString(value));
}
publish(sj.toString());
}
}
}
return contain;
}
}
}
}
来源：https://stackoverflow.com/questions/34574920/displaying-iteration-in-each-jtextarea