我想从JButton调用类中的方法。如下所示：我正在尝试从JButton调用Font（）。
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Scanner;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author KawaiiNeko
*/
public class Summarise extends javax.swing.JFrame {
/**
* Creates new form Summarise
*/
public Summarise() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
input = new javax.swing.JTextArea();
jButton2 = new javax.swing.JButton();
jScrollPane2 = new javax.swing.JScrollPane();
output = new javax.swing.JTextArea();
jButton3 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
input.setEditable(false);
input.setColumns(20);
input.setRows(5);
jScrollPane1.setViewportView(input);
jButton2.setText("Summarise");
jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton2MouseClicked(evt);
}
});
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
output.setEditable(false);
output.setColumns(20);
output.setRows(5);
jScrollPane2.setViewportView(output);
jButton3.setText("Find File");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
.addComponent(jScrollPane1)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 139, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton2)
.addComponent(jButton3))
.addGap(18, 18, 18)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 224, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
OpenFile of = new OpenFile();
try{
of.FilePicker();
}catch(Exception e){
e.printStackTrace();
}
input.setText(of.sb.toString());
}
public void Font(Graphics g){
Scanner getFont = new Scanner("UserInput.txt");
while(getFont.hasNext()){
getFont.nextLine();
}
int fontSize = g.getFont().getSize();
if(fontSize >= 14){
try{
output.setText("Font Size: "+String.valueOf(fontSize));
output.setText(getFont.nextLine());
}catch(Exception e){
e.printStackTrace();
}
}else{
output.setText("Nothing to do here");
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Font(g);
}
private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Summarise.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Summarise.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Summarise.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Summarise.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Summarise().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextArea input;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea output;
// End of variables declaration
}
有关更具体的视图：
public void Font(Graphics g){
Scanner getFont = new Scanner("UserInput.txt");
while(getFont.hasNext()){
getFont.nextLine();
}
int fontSize = g.getFont().getSize();
if(fontSize >= 14){
try{
output.setText("Font Size: "+String.valueOf(fontSize));
output.setText(getFont.nextLine());
}catch(Exception e){
e.printStackTrace();
}
}else{
output.setText("Nothing to do here");
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Font(g);
}
当我按下JButton时，我想执行Font（）方法。 Font（）方法获取每行文本文档的字体大小（如果我编码正确）。字体大小然后显示在textArea“输出”中。
我不一定要专门使用此代码，但是任何可以给我相同结果的东西都会有很大帮助。