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java – 填充JTree
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我有一个A类对象数组,其中包含一个B类对象数组.
我有很多问题:(编码示例会有很大帮助)
>如何将父节点的JTree用作对象A,将子节点用作B并填充它?
>假设整个JFrame分为两个面板(一个包含JTree,另一个显示对应于JTree上选择的选项的对象属性的JPanel),我该如何实现?截至目前,我能够将值硬编码到JTree中.
我在网上搜索了很多例子但是只能找到基本的例子.
这是我到目前为止所做的:
public class A {
int a1=10;
int a2=20;
B bobj[]=new B[2];
A(){
bobj[0]=new B();
bobj[1]=new B();
}
}
class B {
int b=30;
}
在我的Jtree代码中:
import javax.swing.tree.TreeModel;
public class try1 extends javax.swing.JFrame {
static A a2=new A();
/** Creates new form try1 */
public try1() {
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() {
jScrollPane1 = new javax.swing.JScrollPane();
Tree = new javax.swing.JTree();
jPanel1 = new javax.swing.JPanel();
jPanel2 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
Tree.setModel(a2);
Tree.setAutoscrolls(true);
Tree.setRootVisible(true);
jScrollPane1.setViewportView(Tree);
Tree.getAccessibleContext().setAccessibleName("");
Tree.getAccessibleContext().setAccessibleDescription("");
jPanel1.setBackground(new java.awt.Color(254, 254, 254));
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 655, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 569, Short.MAX_VALUE)
);
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 463, Short.MAX_VALUE)
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 151, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 236, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(21, 21, 21))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(473, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(43, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jPanel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 569, Short.MAX_VALUE))
.addContainerGap(24, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
a2=new A();
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new try1().setVisible(true);
}
});
}
// Variables declaration - do not modify
public javax.swing.JTree Tree;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration
}
我找到了这个例子here
1.由于eg的初始格式是一个字符串数组,因此它们使用的是hastable.由于我使用的是包含B对象的一类对象(A),我应该怎么做(我上面得到了一个错误).
我已经附上了我的Frame的布局.我在屏幕截图中硬编了Jtree.我应该怎么做,如果我点击任何Jtree节点,我能够查看它附近的JTextField的详细信息?
解决方法:
根据您的程序片段和图像,您可能希望从研究How to Use Trees中讨论的TreeDemo示例开始.可以在here找到相关示例.
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