Question

我知道您可以将ImageIcon设置为JLabel对象中的图像。我想知道是否可以使用teh .setTaxt方法（或任何其他方法）稍后通过程序更改JLabel中的图像。这是我的计划：

  import javax.swing.*;
 import java.awt.* ;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import javax.swing.border.Border;

public class Teststuff extends JFrame implements ActionListener{


String imgname = new String();
int imgcount = 11;

    JButton nxt = new JButton("Next");
    JButton prev = new JButton("Previous");
    JButton nxt10 = new JButton("Next 10");
    JButton prev10 = new JButton("Previous 10");

public Teststuff(){
    super("Pic Hider");
    setLookAndFeel();
    setSize(1300, 800);
    BorderLayout lay = new BorderLayout();
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);

    imgname = "teststuff/" + imgcount + ".jpg";

    ImageIcon test = new ImageIcon (getClass().getResource(imgname));
    Image img = test.getImage() ;
    Image newimg = img.getScaledInstance( 850, 600,  java.awt.Image.SCALE_SMOOTH ) ;  
    test = new ImageIcon( newimg );

    JPanel buttons = new JPanel();
    GridLayout blay = new GridLayout (0,4);
    buttons.setLayout(blay);

    JLabel tryi = new JLabel(test);
    JLabel head = new JLabel("Secret Pic Viewer Program", JLabel.CENTER);

    nxt.addActionListener(this);
    prev.addActionListener(this);
    nxt10.addActionListener(this);
    prev10.addActionListener(this);

    buttons.add(prev10);        
    buttons.add(prev);
    buttons.add(nxt);
    buttons.add(nxt10);

    add(head, BorderLayout.NORTH);
    add(tryi, BorderLayout.CENTER);
    add(buttons, BorderLayout.SOUTH);


}

@Override
public void actionPerformed(ActionEvent event) {
    Object source = event.getSource();
 if(source == nxt){
     imgcount = imgcount + 1;
     imgname = "teststuff/" + imgcount + ".jpg";

 }
 else if(source == prev){
        imgcount = imgcount - 1;
     imgname = "teststuff/" + imgcount + ".jpg";
 }
 else if(source == prev10){
        imgcount = imgcount - 10;
     imgname = "teststuff/" + imgcount + ".jpg";
 }
 else if(source == nxt10){
      imgcount = imgcount + 10;
     imgname = "teststuff/" + imgcount + ".jpg";
 }
}

private void setLookAndFeel() {
    try {
        UIManager.setLookAndFeel(
                "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"
                );
    } catch (Exception exc) {

    }
}

public static void main(String[] args) {
    Teststuff dog = new Teststuff();
}
}

我刚从java开始，只是在试验。我知道这可能不是这样写的，我的变量名很随意...提前谢谢

Answer 1

显然不是setText()，而是setIcon()。难道你不能通过浏览javadoc找到自己吗？

是否可以使用.setText（）方法在一个程序的后期为标签设置图像？

1 个答案: