将输入按钮中的信息传递给标签

Question

我正在尝试使showBtn或Input按钮传递用户将在TextFields（itemNameTF，itemNumTF，itemUPCTF，itemQtyTF和itemUMTF）中输入的信息以显示在两个标签（itemQtyLbl，itemUMLbl）中，但我得到的只是一个错误，当我按下输入按钮时，我正在进入下一个窗口，但在下一个窗口中，当我按下“显示”按钮时，我不会得到用户在TextFields中输入的信息，我会感激任何帮助，提前谢谢。

代码：

import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Dimension;
import java.awt.Label;
import java.awt.BorderLayout;
import java.awt.Point;
import java.awt.Color;
import java.awt.Font;
import java.awt.Button;
import java.awt.Rectangle;
import java.awt.TextField;

public class EnterItemInfo extends UsefulFrame implements ActionListener {

    private static final long serialVersionUID = 1L;
    private Label compNameLbl = null;
    private Button showBtn = null;
    private Label itemQtyLbl = null;
    private Label itemUMLbl = null;
    public Item item;
    private Label itemNameLbl = null;
    private Label itemNumLbl = null;
    private Label itemUPCLbl = null;
    private TextField itemNameTF = null;
    private TextField itemNumTF = null;
    private TextField itemUPCTF = null;
    private TextField itemQtyTF = null;
    private TextField itemUMTF = null;

    @Override
    public void actionPerformed(ActionEvent e) {
        // itemQtyLbl.setText(item.getItemQty() + " " + item.getItemUM() + " " +
        // item.getItemName() + " " + "units");
        // itemUMLbl.setText("were received with a UPC of" + " " +
        // item.getItemUPC());

        itemQtyLbl.setText(getItemQtyTF() + " " + getItemUMTF() + " "
                + getItemNameTF() + " " + "units");
        itemUMLbl.setText("were received with a UPC of" + " " + getItemUPCTF());

        itemNameTF.setText("");
        itemNumTF.setText("");
        itemUPCTF.setText("");
        itemQtyTF.setText("");
        itemUMTF.setText("");
        ItemFrame iFrame = new ItemFrame(item);
        // TODO Auto-generated method stub

    }

    /**
     * This is the default constructor
     * 
     * @param i
     */
    public EnterItemInfo() {
        super();

        initialize();

    }

    /**
     * This method initializes this
     * 
     * @return void
     */
    private void initialize() {
        itemUPCLbl = new Label();
        itemUPCLbl.setForeground(Color.green);
        itemUPCLbl.setLocation(new Point(74, 185));
        itemUPCLbl.setSize(new Dimension(120, 23));
        itemUPCLbl.setAlignment(Label.RIGHT);
        itemUPCLbl.setText("UPC Code");
        itemNumLbl = new Label();
        itemNumLbl.setForeground(Color.green);
        itemNumLbl.setLocation(new Point(74, 132));
        itemNumLbl.setSize(new Dimension(120, 23));
        itemNumLbl.setAlignment(Label.RIGHT);
        itemNumLbl.setText("Item Number");
        itemNameLbl = new Label();
        itemNameLbl.setForeground(Color.green);
        itemNameLbl.setLocation(new Point(74, 79));
        itemNameLbl.setSize(new Dimension(120, 23));
        itemNameLbl.setAlignment(Label.RIGHT);
        itemNameLbl.setText("Item Name");
        itemUMLbl = new Label();
        itemUMLbl.setText("Unit of Measure");
        itemUMLbl.setSize(new Dimension(120, 20));
        itemUMLbl.setAlignment(Label.RIGHT);
        itemUMLbl.setForeground(Color.green);
        itemUMLbl.setLocation(new Point(74, 288));
        itemQtyLbl = new Label();
        itemQtyLbl.setText("Quantity");
        itemQtyLbl.setSize(new Dimension(120, 20));
        itemQtyLbl.setAlignment(Label.RIGHT);
        itemQtyLbl.setForeground(Color.green);
        itemQtyLbl.setLocation(new Point(74, 238));
        compNameLbl = new Label();
        compNameLbl.setText("TNT Salvage");
        compNameLbl.setSize(new Dimension(384, 36));
        compNameLbl.setBackground(Color.orange);
        compNameLbl.setFont(new Font("Verdana", Font.PLAIN, 24));
        compNameLbl.setAlignment(Label.CENTER);
        compNameLbl.setLocation(new Point(8, 30));
        this.setSize(400, 350);
        this.setTitle("Item Information");
        Item item = new Item("", "", "", "", "");

        this.add(compNameLbl, BorderLayout.NORTH);

        this.add(itemQtyLbl, null);
        this.add(itemUMLbl, null);
        this.add(itemNameLbl, null);
        this.add(itemNumLbl, null);
        this.add(itemUPCLbl, null);
        this.add(getItemNameTF(), null);
        this.add(getItemNumTF(), null);
        this.add(getItemUPCTF(), null);
        this.add(getItemQtyTF(), null);
        this.add(getItemUMTF(), null);
        this.setLayout(null);
        this.add(getShowBtn(), null);
        this.setVisible(true);
        this.setExitButtonLocation();

    }

    /**
     * This method initializes showBtn
     * 
     * @return java.awt.Button
     */
    private Button getShowBtn() {
        if (showBtn == null) {
            showBtn = new Button();
            showBtn.setLocation(new Point(164, 323));
            showBtn.setLabel("Input");
            showBtn.setName("inputBTN");
            showBtn.setSize(new Dimension(60, 20));
            showBtn.addActionListener(this);
        }
        return showBtn;
    }

    /**
     * This method initializes itemNameTF
     * 
     * @return java.awt.TextField
     */
    private TextField getItemNameTF() {
        if (itemNameTF == null) {
            itemNameTF = new TextField();
            itemNameTF.setLocation(new Point(204, 79));
            itemNameTF.setSize(new Dimension(150, 23));
        }
        return itemNameTF;
    }

    /**
     * This method initializes itemNumTF
     * 
     * @return java.awt.TextField
     */
    private TextField getItemNumTF() {
        if (itemNumTF == null) {
            itemNumTF = new TextField();
            itemNumTF.setLocation(new Point(204, 132));
            itemNumTF.setSize(new Dimension(50, 23));
        }
        return itemNumTF;
    }

    /**
     * This method initializes itemUPCTF
     * 
     * @return java.awt.TextField
     */
    private TextField getItemUPCTF() {
        if (itemUPCTF == null) {
            itemUPCTF = new TextField();
            itemUPCTF.setLocation(new Point(204, 185));
            itemUPCTF.setSize(new Dimension(75, 23));
        }
        return itemUPCTF;
    }

    /**
     * This method initializes itemQtyTF
     * 
     * @return java.awt.TextField
     */
    private TextField getItemQtyTF() {
        if (itemQtyTF == null) {
            itemQtyTF = new TextField();
            itemQtyTF.setLocation(new Point(204, 238));
            itemQtyTF.setSize(new Dimension(50, 23));
        }
        return itemQtyTF;
    }

    /**
     * This method initializes itemUMTF
     * 
     * @return java.awt.TextField
     */
    private TextField getItemUMTF() {
        if (itemUMTF == null) {
            itemUMTF = new TextField();
            itemUMTF.setLocation(new Point(204, 288));
            itemUMTF.setSize(new Dimension(75, 23));
        }
        return itemUMTF;
    }

} // @jve:decl-index=0:visual-constraint="10,8"

Answer 1

在您的actionPerformed中，只需获取所有文字someTextField.getText()，然后在标签someLabel.setText("someText");

中设置文字

public void actionPerformed(ActionEvent e){
    // example
    String someTextFieldInput = someTextField.getText();

    // if they are numbers from the field, you must parse
    // example
    int someInt = Integer.parseInt(someTextField.getText();

    // after you get all your input from the text fields, add them to labels
    someLabel.setText(someTextFieldInput);
    someOtherLabel.setText(String.valueOf(someInt));

}

您还应该将ItemFrame作为EnterItemInfo的内部类，这样它就可以使用所有文本字段。将操作执行到您在EnterItemInfo中获取文本的位置，并将其注册到该类中的按钮。

public class EnterItemInfo extends JFrame {
    private ItemFrame iFrame = new iFrame();
    ... all text fields and labels

    private JButton showBut = new JButton("show");

    public ItemFrame(){
        ... add components
        iFrame.setVisible(false);
        add(iFrame);

        add(showBut);
        showBut.addActionListener(new ActionListener(){
            iFrame.setVisible(true);
        });
    }

    private class ItemFrame extends JFrame {
        private JButton button = new JButton("show info");
        public ItemFrame(){
            add(new JLabel(), BorderLayout.CENTER);
            add(button, borderLayout.NORTH);

            button.addActionListener(new ActionListener(){
                ... do stuff
            });

        }
    }
}

或者你可以让ItemFrame扩展EnterItemFrame。我不确定你从一帧到下一帧输入是否有问题。如果没有，请保持原样。