我有3個類,我已經寫了下面的一些部分。當我在AddStudent類中寫入`this語句時,它將顯示abcd1234哪個是密碼,但是當我將它寫入MainFrame類時,它將返回null.why ??? (我使用AddStudent的構造函數將我的管理對象從MainFrame發送到AddStudent)(我需要在大型機的AddStudent類中創建的管理對象的信息) 我該怎麼辦?爲什麼它返回null?
management.getStudentsPassword();
我傳遞addStudent類:
public class AddStudent extends javax.swing.JDialog {
private SystemManagement management;
/** Creates new form AddStudent */
public AddStudent(java.awt.Frame parent, boolean modal, SystemManagement management) {
super(parent, modal);
initComponents();
this.management = management;
}
我的MainFrame類:
public class MainFrame extends javax.swing.JFrame {
/** Creates new form MainFrame */
private SystemManagement management;
.
.
.}
我SystemManagement類:
private String studentsPass;
...
public void setStudentspassword(String password){
studentsPass = password;
}
public String getStudentsPassword(){
return studentsPass;
}
你需要展示它是如何連接在一起在主機類... 另外,在我看來,這應該與「功課」被標記... – Stephen 2009-11-25 09:16:18