如何在java中调用另一个类中的字符串

我是一个真正的疯子，所以如果我没有向你问好，请原谅

这就是：

 public class carti extends JFrame {
    JTextField txttitlu;
    JTextField txtautor;
    JTextField txtcat;
    JTextField txtedi;
    JTextField txtpret;
    DefaultListModel model;
    JList lista;
    String editura;
    String titlu;
    String autor;
    String categorie;

这是我拥有的主要类函数，在这个类中，我有4个JTextFields，通过按钮插入到JList中（这里是添加按钮“caled”adauga的脚本）：

所以我想要的是：按钮“Adauga”添加到我的JList中的内容将显示在扩展的新类（称为“detalii”）上（这里是si创建的新类（“detalii”）中的代码）：

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谢谢你的帮助，如果我的解释没有正确完成，我真的很抱歉。希望你能理解，不要浪费你的时间。

如果我理解正确，你希望“detalii”类的标签用“Adauga”提供的信息更新我想一种方法是从“Adauga”方法调用“detalii”中的方法

这就是我将如何改变“阿杜加”：

我将“detalii”改为：

private JLabel lbltitlu;
private JLabel lblautor;
private JLabel lbleditura;
private JLabel lblcategorie;

public detalii(){

    this.setTitle("Detalii despre Carte");
    setSize(400, 300);
    setResizable(false);
    setLocation(370, 150);
    setLayout(null);
    lbltitlu= new JLabel("Titlu" +" : "); 
    lbltitlu.setBounds(15, 5, 120, 25);
    this.add(lbltitlu);
    lblautor= new JLabel("Autor" +" : "); 
    lblautor.setBounds(15, 25, 120, 25);
    this.add(lblautor);
    lblcategorie= new JLabel("Categorie" +" : "); 
    lblcategorie.setBounds(15, 45, 120, 25);
    this.add(lblcategorie);
    lbleditura= new JLabel("Editura" +" : "  ); 
    lbleditura.setBounds(15, 65, 120, 25);
    this.add(lbleditura);
}

public void pushNewInfo(String author, String title, 
                        String category, String editor) {
    lblautor.setText("Autor : " + author);
    lbltitlu.setText("Titlu : " + title);
    lblcategorie.setText("Categorie : " + category);
    lbleditura.setText("Editura : " + editor);
}

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这可能不是最好的解决方案，但根据您提供的信息，我将以这种方式解决您的问题。

问题是什么？问题是如何将我在主类（称为“carti”）中获得的值从“detalii”添加到JLabel中，并通过按钮Adauga将其添加到我在同一个类中拥有的JList（希望您理解）感谢您提供的信息，但它表示：无法对非静态方法pushNewInfo进行静态引用（String，String，String，String）从类型detalii。如果我没有发布足够的详细信息，我会发布更多。对不起，我正在尽力解释，非常感谢你的帮助。啊，是的，很抱歉。你需要在“pushNewInfo”方法中添加“static”关键字，如下所示：public static void pushNewInfo（字符串作者…希望有帮助！

public detalii(){

    this.setTitle("Detalii despre Carte");
    setSize(400, 300);
    setResizable(false);
    setLocation(370, 150);
    setLayout(null);
    JLabel lbltitlu= new JLabel("Titlu" +" : "); 
    lbltitlu.setBounds(15, 5, 120, 25);
    this.add(lbltitlu);
    JLabel lblautor= new JLabel("Autor" +" : "); 
    lblautor.setBounds(15, 25, 120, 25);
    this.add(lblautor);
    JLabel lblcategorie= new JLabel("Categorie" +" : "); 
    lblcategorie.setBounds(15, 45, 120, 25);
    this.add(lblcategorie);
    JLabel lbleditura= new JLabel("Editura" +" : "  ); 
    lbleditura.setBounds(15, 65, 120, 25);
    this.add(lbleditura);

}

public void Adauga() {

    autor = txtautor.getText().trim();
    titlu = txttitlu.getText().trim();
    categorie = txtcat.getText().trim();
    editura = txtedi.getText().trim();

    if (autor.equals("")) {
        JOptionPane.showMessageDialog(null, "Nu ati completat Titlu!");
        return;
    }
    if (titlu.equals("")) {
        JOptionPane.showMessageDialog(null, "Nu ati completat Autor!");
        return;
    }
    if (categorie.equals("")) {
        JOptionPane.showMessageDialog(null, "Nu ati completat Categorie!");
        return;
    }
    String numeComplet = autor + " / " + titlu + " : " + categorie;
    model.addElement(numeComplet);

    detalii.pushNewInfo(autor, titlu, categorie, editura);  // Add This Line!

}

private JLabel lbltitlu;
private JLabel lblautor;
private JLabel lbleditura;
private JLabel lblcategorie;

public detalii(){

    this.setTitle("Detalii despre Carte");
    setSize(400, 300);
    setResizable(false);
    setLocation(370, 150);
    setLayout(null);
    lbltitlu= new JLabel("Titlu" +" : "); 
    lbltitlu.setBounds(15, 5, 120, 25);
    this.add(lbltitlu);
    lblautor= new JLabel("Autor" +" : "); 
    lblautor.setBounds(15, 25, 120, 25);
    this.add(lblautor);
    lblcategorie= new JLabel("Categorie" +" : "); 
    lblcategorie.setBounds(15, 45, 120, 25);
    this.add(lblcategorie);
    lbleditura= new JLabel("Editura" +" : "  ); 
    lbleditura.setBounds(15, 65, 120, 25);
    this.add(lbleditura);
}

public void pushNewInfo(String author, String title, 
                        String category, String editor) {
    lblautor.setText("Autor : " + author);
    lbltitlu.setText("Titlu : " + title);
    lblcategorie.setText("Categorie : " + category);
    lbleditura.setText("Editura : " + editor);
}