Question

我希望我的结果如下。如果我单击“完成”按钮，则会在umlClassList类的setName（通过publicPrivate）和StoreData数组列表中添加一个类。然后我想将它们转换为字符串并在GenCode类的文本框区域中显示它们，例如public ClassName{}

我希望在s3=s1+s2+s3课程中调用textarea后，将GenCode字符串添加到genCode()课程中的StoreData，但为什么只有{}返回public ClassName{}？我想得到public class CreateUmlClass extends JFrame { JRadioButton radio1Public = new JRadioButton("Public"); // Radio Button JRadioButton radio2Private = new JRadioButton("Private"); JButton finish = new JButton("Finish"); JButton cancel = new JButton("Cancel"); JButton clearAll = new JButton("Clear All"); JLabel classNameLabel = new JLabel("Class Name:");// Class name label JLabel methodNameLabel = new JLabel("Method Name:");// Class name label ButtonGroup group = new ButtonGroup(); JTextField methodNameTextField = new JTextField(20);// Class Name Text Box JTextField classNameTextField = new JTextField(20);// Class Name Text Box private JFrame frame; public CreateUmlClass() { super("Create class"); this.setLocation(100, 100); // this.setVisible(true); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setLayout(new FlowLayout()); add(classNameLabel); add(classNameTextField); group.add(radio1Public); group.add(radio2Private); add(radio1Public); add(radio2Private); add(methodNameLabel); add(methodNameTextField); add(finish); add(cancel); add(clearAll); Handler handle = new Handler(); finish.addActionListener(handle); cancel.addActionListener(handle); clearAll.addActionListener(handle); } private class Handler implements ActionListener { String ClassName; StoreData obj = new StoreData(); public void actionPerformed(ActionEvent e) { if (e.getSource() == finish) { ClassName=classNameTextField.getText(); if (classNameTextField != null && (radio1Public.isSelected() || radio2Private.isSelected())) { obj.setName(ClassName); if (radio1Public.isSelected()) { obj.CheckisPrivate(false); } else if (radio1Public.isSelected()) { obj.CheckisPrivate(true); } JOptionPane.showMessageDialog(frame, "Your class is stored"); } else { JOptionPane.showMessageDialog(frame, "Class Name or/and access modifier cannot be empty.", "Inane warning", JOptionPane.WARNING_MESSAGE); } } else if (e.getSource() == cancel) { setVisible(false); } else if (e.getSource() == clearAll) { classNameTextField.setText(null); group.clearSelection(); methodNameTextField.setText(null); } } } }

public class StoreData {

    String name;
    static ArrayList<String> umlClassList = new ArrayList<String>();
    static ArrayList<String> publicPrivate = new ArrayList<String>();

    public void setName(String className) {

        umlClassList.add(className);

    }

    public void CheckisPrivate(boolean isPrivate) {
        if (isPrivate = true) {
            publicPrivate.add("Private");
        } else if (isPrivate = false) {
            publicPrivate.add("Public");
        }
    }

    public String genCode() {
        String s3="";
        for (int index = 0; index < umlClassList.size(); index++) {
            String s1,s2;
            s1=publicPrivate.get(index);
            s2=umlClassList.get(index);
            s3=s3+s1+s2;        
        }
        return s3+"{"+"}";

    }

}

StoreData类

public class GenCode extends JFrame{

    JLabel genedCode = new JLabel("The generated code:");
    StoreData data = new StoreData();
    String finalCode =data.genCode();
    JTextArea codeBox = new JTextArea(finalCode,5,30);
    JButton okbtn = new JButton("OK");
    JButton cancel = new JButton("Cancel");
    Handler handle = new Handler();

    private JFrame frame;
    public GenCode(){
        super("The Generated Code");
        setSize(200, 900);
        setLocation(200, 200);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLayout(new FlowLayout());


        //add(codeBox); 
        add(codeBox);
        codeBox.setVisible(true);
        codeBox.setEditable(false);
        add(okbtn);
        add(cancel);


        //add(codeBox,BorderLayout.CENTER);
        cancel.addActionListener(handle);

    }
    private class Handler implements ActionListener {

        public void actionPerformed(ActionEvent e) {
            if(e.getSource()==cancel){
                setVisible(false);
            }
        }
        }

}

GenCode类

{{1}}

Answer 1

您的代码

public String genCode() {
    String s3="";
    for (int index = 0; index < umlClassList.size(); index++) {
        String s1,s2;
        s1=publicPrivate.get(index);
        s2=umlClassList.get(index);
        s3=s3+s1+s2;        
    }
    return s3+"{"+"}";

}

可以简化为

public String genCode() {
    String s3="";
        String s1,s2;
        if(umlClassList.size()>0)
        {
            s1=publicPrivate.get(umlClassList.size()-1);
            s2=umlClassList.get(umlClassList.size()-1);
        }
        s3=s3+s1+s2;        
    return s3+"{"+"}";

}

因此它返回“{}”的原因是因为“umlClassList”为空并且您不更新s1和s2。您可以通过

进行检查

if(umlClassList.size()==0) System.out.println("umlClassList is empty" );

为什么这不会返回我想要的确切字符串？

1 个答案: