我是java的新手，我似乎无法解决这个问题。我知道我错过了什么。
基本上我尝试做的是阅读JTextfield中用户的输入，然后显示用户输入的另一个JTextfield。
我希望在点击添加按钮后发生这一切。点击添加按钮后，我希望第一个JTextfield的用户输入显示在另一个JTextfield中。
但是当输入内容到第一个文本字段并按下添加按钮时，我会在另一个null中获得JTextfield值。我无法弄清楚为什么。
我正在使用应该使用.gettext（）方法存储用户输入内容的类变量。
不确定任何帮助的内容是值得赞赏的。
package inventoryprogrampart6;
import javax.swing.JFrame;
public class AddItemWin extends javax.swing.JFrame {
private int itNm,unitNm,yr;
private String prodName;
private double price;
/**
* Creates new form AddItemWin
*/
public AddItemWin() {
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() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
textField1 = new java.awt.TextField();
textField2 = new java.awt.TextField();
textField3 = new java.awt.TextField();
textField4 = new java.awt.TextField();
textField5 = new java.awt.TextField();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "Add New Item", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, new java.awt.Font("Times New Roman", 1, 12))); // NOI18N
jLabel1.setText("Item Number:");
jLabel2.setText("Product Name:");
jLabel3.setText("Number of Units:");
jLabel4.setText("Prodcut Price");
jLabel5.setText("Year Made:");
jButton1.setText("Add Item");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel5, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel4, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel3, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel1, javax.swing.GroupLayout.Alignment.TRAILING))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(textField1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(textField2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(textField3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(textField4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(textField5, javax.swing.GroupLayout.DEFAULT_SIZE, 166, Short.MAX_VALUE)))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(157, 157, 157)
.addComponent(jButton1)))
.addContainerGap(156, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel1)
.addComponent(textField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(textField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel3))
.addComponent(textField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel4))
.addComponent(textField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel5)
.addComponent(textField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(21, 21, 21)
.addComponent(jButton1)
.addContainerGap(23, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(76, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
textField5.setText(String.valueOf(getitNm()));
}
public void addToArray()
{
itNm = Integer.parseInt(textField1.getText());
prodName = (textField2.getText());
unitNm = Integer.parseInt(textField3.getText());
price = Double.parseDouble(textField4.getText());
yr = Integer.parseInt(textField5.getText());
}
public int getitNm()
{
return itNm;
}
public String getProdName()
{
return prodName;
}
public int getunitNm()
{
return unitNm;
}
public double getprice()
{
return price;
}
public int getyear()
{
return yr;
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JPanel jPanel1;
private java.awt.TextField textField1;
private java.awt.TextField textField2;
private java.awt.TextField textField3;
private java.awt.TextField textField4;
private java.awt.TextField textField5;
// End of variables declaration
}
答案 0 :(得分：0)
您没有在班级的任何地方调用此方法
public void addToArray()
这就是您输入的值未存储的原因
答案 1 :(得分：0)
首先，你不需要所有额外的代码，它只是浪费内存。在实例化类型时取出包名称。其次，你不能只是从文本字段解析某些文本，你必须先将值放在一个字符串中。如果这不起作用，请尝试
myTextBox.setEnabled(true);
如果您需要更多帮助，请问我。
答案 2 :(得分：0)
存在许多问题，主要围绕问题而实际上并不知道你想要实现的是什么......
如果任何字段没有文字（或无法作为int填充的文字），这将导致错误
public void addToArray() {
itNm = Integer.parseInt(textField1.getText());
prodName = (textField2.getText());
unitNm = Integer.parseInt(textField3.getText());
price = Double.parseDouble(textField4.getText());
yr = Integer.parseInt(textField5.getText());
}
这意味着，如果您将最后一个字段留空，则通过NumberFormatException。现在，您想要将第一个字段的内容复制到最后一个字段这一事实让我更有理由为什么您需要此字段的内容。
在jButton1ActionPerformed方法中，您可以简单地使用textField5.setText(textField1.getText())并实现您想要的效果