Question

我是Java语言的新手，我开始自己和互联网制作一个程序。现在我有这个：

package com.butoane;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class App {
private JButton apasaAiciButton;
private JPanel Dunno;
private JButton apoiaici;
private JTextArea text1;
private JProgressBar progressBar1;
private JTextArea text2;

public App() {
   String a = "H";
   String b = "e";
   String y = "Ce faci sefule??";
    final String[] d = {"x"};
    final String[] f = {"D"};
    final int[] c = {0};
    apasaAiciButton.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            //apoiaici.setEnabled(true);
            //apasaAiciButton.setEnabled(false);
            text1.append(a);
            progressBar1.setValue(c[0] +1);
            c[0] = c[0] +1;
        }

    });
    apoiaici.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            //apoiaici.setEnabled(false);
            //apasaAiciButton.setEnabled(true);
            apasaAiciButton.setText("Apasa iar aici");
            text1.append(b);
            progressBar1.setValue(c[0] +1);
            c[0] = c[0] +1;
        }
    });

    }

public static void main(String[] args) {
    JFrame frame = new JFrame("App");
    frame.setContentPane(new App().Dunno);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
}
}

我想要做的是在进度条为100％时向text2添加功能。例如：当progressbar1为100％时，text2将文本设置为＆＃34;你做到了！＆＃34; 。我该怎么做？

FYK：我看过有关JProgressBar和JTextArea的oracle文档，我无法理解。

Answer 1

进度条是否有效？如果它有效，那么只需添加。

//the max value of the progress bar == actual value
if (progressBar1.getMaximum() == progressBar1.getValue() {
    text2.append("You did it!");
}

Answer 2

您的代码将抛出NullPointerException，因为您没有初始化任何小部件。向您的进度条添加一个监听器（假设您正在使用Java 8 +）

A<-ggplot(data = subset(DF,site=="A"), aes(x = SWC, y = LE)) +
   geom_smooth(method = "lm", se=FALSE, color="black", formula = y ~ x) +
   geom_point() 
B<-ggplot(data = subset(DF,site=="B"), aes(x = SWC, y = LE)) +
  geom_smooth(method = "lm", se=FALSE, color="black", formula = y ~ x) +
  geom_point() 
C<-ggplot(data = subset(DF,site=="C"), aes(x = SWC, y = LE)) +
  geom_smooth(method = "lm", se=FALSE, color="black", formula = y ~ x) +
  geom_point() 
D<-ggplot(data = subset(DF,site=="D"), aes(x = SWC, y = LE)) +
  geom_smooth(method = "lm", se=FALSE, color="black", formula = y ~ x) +
  geom_point() 
E<-ggplot(data = subset(DF,site=="E"), aes(x = SWC, y = LE)) +
  geom_smooth(method = "lm", se=FALSE, color="black", formula = y ~ x) +
  geom_point()
Blank<-ggplot()
multiplot(Blank, A, B, C, D, E, cols=3)

如果进度条为100％，如何更改JTextArea

2 个答案: