我有一个定制的JPanel，它是在一个单独的类文件中制成的，带有一些参数，名为itemCard，我试图通过在另一个jframe的另一个jpanel（contentAreaPane）中的参数中给出值来添加它的实例。 mainPage.java）类文件上的按钮（jButton1）的actionPerformed事件
itemCard.java
import javax.swing.*;
import Resources.colors.MaterialColor;
import Resources.fonts.*;
/**
*
* @author Aditya
*/
public class itemCard extends JPanel {
/**
* Creates new form itemCard
*/
public String name,price,retailer, prodID;
/**
* Takes four parameters, first is product ID which is a String, second is product
* name which is a String, third is price which is a String,
* fourth is retailer name which is a String.
*/
public itemCard(String prodID, String productName, String price, String retailer) {
this.name = productName;
this.price = price;
this.retailer = retailer;
this.prodID = prodID;
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
imageIconHolder = new javax.swing.JLabel();
detailPane = new javax.swing.JPanel();
priceTag = new javax.swing.JLabel();
jScrollPane2 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
setBackground(new java.awt.Color(255, 255, 255));
setBorder(new javax.swing.border.LineBorder(MaterialColor.BLUE_200, 2, true));
setPreferredSize(new java.awt.Dimension(250, 300));
addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseEntered(java.awt.event.MouseEvent evt) {
formMouseEntered(evt);
}
public void mouseExited(java.awt.event.MouseEvent evt) {
formMouseExited(evt);
}
});
setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
imageIconHolder.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
imageIconHolder.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
imageIconHolder.setMaximumSize(new java.awt.Dimension(250, 200));
imageIconHolder.setMinimumSize(new java.awt.Dimension(250, 200));
imageIconHolder.setPreferredSize(new java.awt.Dimension(250, 200));
add(imageIconHolder, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 250, 200));
detailPane.setBackground(MaterialColor.LIGHTBLUE_800);
detailPane.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
priceTag.setBackground(MaterialColor.PURPLE_800);
priceTag.setFont(Montserrat.REGULAR.deriveFont(25f));
priceTag.setForeground(new java.awt.Color(255, 255, 255));
priceTag.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
priceTag.setText(price);
priceTag.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
priceTag.setMaximumSize(new java.awt.Dimension(70, 100));
priceTag.setMinimumSize(new java.awt.Dimension(70, 100));
priceTag.setOpaque(true);
priceTag.setPreferredSize(new java.awt.Dimension(70, 100));
detailPane.add(priceTag, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 70, 100));
jScrollPane2.setBorder(null);
jScrollPane2.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
jScrollPane2.setVerticalScrollBarPolicy(javax.swing.ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
jScrollPane2.setEnabled(false);
jScrollPane2.setPreferredSize(new java.awt.Dimension(180, 100));
jTextArea1.setEditable(false);
jTextArea1.setBackground(MaterialColor.DEEPPURPLE_700);
jTextArea1.setColumns(20);
jTextArea1.setFont(Roboto.THIN.deriveFont(20f)
);
jTextArea1.setForeground(new java.awt.Color(51, 51, 51));
jTextArea1.setLineWrap(true);
jTextArea1.setRows(5);
jTextArea1.setText(((name.length()>51)?(name.substring(0, 48)+"...") : (name)) +"\n"+ ((retailer.length()>14)?(retailer.substring(0, 14)+"...") : (retailer)));
jTextArea1.setToolTipText(name+"\n"+retailer);
jTextArea1.setWrapStyleWord(true);
jTextArea1.setBorder(null);
jTextArea1.setMargin(new java.awt.Insets(7, 5, 7, 5));
jTextArea1.setRequestFocusEnabled(false);
jScrollPane2.setViewportView(jTextArea1);
detailPane.add(jScrollPane2, new org.netbeans.lib.awtextra.AbsoluteConstraints(70, 0, 180, 100));
add(detailPane, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 200, 250, 100));
}// </editor-fold>
private void formMouseEntered(java.awt.event.MouseEvent evt) {
this.setBorder(new javax.swing.border.LineBorder(MaterialColor.BLUE_400, 3, true));
detailPane.setBackground(MaterialColor.LIGHTBLUE_900);
}
private void formMouseExited(java.awt.event.MouseEvent evt) {
this.setBorder(new javax.swing.border.LineBorder(MaterialColor.BLUE_200, 2, true));
detailPane.setBackground(MaterialColor.LIGHTBLUE_800);
}
// Variables declaration - do not modify
private javax.swing.JPanel detailPane;
private javax.swing.JLabel imageIconHolder;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JLabel priceTag;
// End of variables declaration
}
这是我按钮的动作执行的事件侦听器：
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try{
JPanel itemcard = new itemCard("123456789AB","Inspiron 7567 Intel Core i5 DELL Laptop","68K","CloudTail Pvt. Ltd.");
contentAreaPane.add(itemcard);
contentAreaPane.revalidate();
contentAreaPane.repaint();
}catch(Exception e){
e.printStackTrace();
}
}
但是，这不起作用，这是因为单击jButton1时没有创建新的itemCard JPanel并将其显示在contentAreaPane JPanel中，并且出现以下错误：
java.lang.IllegalArgumentException
at org.netbeans.lib.awtextra.AbsoluteLayout.addLayoutComponent(Unknown Source)
at java.desktop/java.awt.Container.addImpl(Container.java:1152)
at java.desktop/java.awt.Container.add(Container.java:436)
at AppFrames.mainPage.jButton1ActionPerformed(mainPage.java:887)
at AppFrames.mainPage$31.actionPerformed(mainPage.java:619)
我该如何解决？
答案 0 :(得分：0)
在Container文档中，列出了以下例外情况：
IllegalArgumentException - if index is invalid; if comp is a child of this container, the valid range is [-1, getComponentCount()-1]; if component is not a child of this container, the valid range is [-1, getComponentCount()]
IllegalArgumentException - if comp is an ancestor of this container
IllegalArgumentException - if adding a window to a container
我认为您必须在条件2或3下得到这个