從文本字段提取數據並將其顯示在另一個文本字段中

Question

//combo box actionperformed method. 

private void CmbActionPerformed(java.awt.event.ActionEvent evt) {          
//created aray of objects 

    JTextField t[]=new JTextField[8]; 

    String num=null,s1; 
    int num1=0; 
    num=Cmb.getSelectedItem().toString(); 
    num1=Integer.parseInt(num); 
    //applied a logic to create same no. of textfields that selected in combo box. 

    while(num1!=0){ 
     for(int i=0;i<num1;i++) 
     { 
      t[i]=new JTextField(10); 
      jPanel2.add(t[i]); 
      b1.setText("the objects has created"); 
      jPanel2.revalidate(); 
      validate(); 
      num1--; 
     } 
    } 
} 
//actionperformed method of buuton b1. 
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { 

    String a1; 
    a1=t1.getText(); 

    //getting error t1 not found; 
    //I think it is because t1 is local aray of comboactionperformedmethod and cant be accessed by this method. I need ur help to solve this. 

    b1.setText(s1); 
} 

Answer 1

最簡單的方法是將您的文本區域字段聲明爲類成員變量，而不是在方法內部。然後該類中的其他方法可以訪問它們。

JTextField t[]=new JTextField[8]; 
//created aray of objects 

private void CmbActionPerformed(java.awt.event.ActionEvent evt) 
{ 

然後：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { 

    String a1; 
    a1=t[0].getText(); 

還要注意訪問數組成員的正確方法。