JradioButton將不工作

Question

我在哪裏我的JRadioButtons不會出現，直到將鼠標懸停在的問題。我查過這個問題之前，似乎大多數人已經解決了它使用layouts。但是，我不應該將其用於我的任務，是完全新的圖形與的Java我真的很掙扎。有任何想法嗎？任何感謝。

import java.awt.GridLayout; 

import javax.swing.*; 
public class InsuarancePolicyApp { 

public static void main(String[] args) { 

//JFrame 
JFrame f = new JFrame(); 
f.setVisible(true); 
f.setSize(800, 600); 
f.setLayout(null); 
f.setResizable(false); 
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
f.setTitle("Insurance Policy Application"); 

//JButtons 
JButton addClient = new JButton("Add Client"); 
JButton openPolicy = new JButton("Open Policy"); 
f.getContentPane().add(addClient); 
f.getContentPane().add(openPolicy); 
openPolicy.setSize(300, 60); 
addClient.setSize(380,60); 
addClient.setLocation(30, 180); 
openPolicy.setLocation(450, 180); 

//JTextField 
JTextField name = new JTextField("Name: "); 
f.getContentPane().add(name); 
name.setLocation(30,30); 
name.setSize(380, 30); 

//JList 
String[] clientarray = {"Mark Mywords", "Jim Class", "Stan Dupp", "Mel Onhead", "Bob's Yoyo Shop", "Toys Aren't Us", "The Fish Rack"}; 
JList clients = new JList(clientarray); 
f.getContentPane().add(clients); 
clients.setLocation(30, 280); 
clients.setSize(380, 250); 

String[] policyarray = {"Policy 002354","Policy 005345", "Depreciable Policy 0789423", "Expirable Policy 009724"}; 
JList policies = new JList(policyarray); 
f.getContentPane().add(policies); 
policies.setLocation(450, 280); 
policies.setSize(300, 250); 


//JScrollPane 
JScrollPane clientScroll = new JScrollPane(clients, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED); 
f.getContentPane().add(clientScroll); 
clientScroll.setLocation(30,280); 
clientScroll.setSize(380,250); 


JScrollPane policiesScroll = new JScrollPane(policies, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED); 
f.getContentPane().add(policiesScroll); 
policiesScroll.setLocation(450,280); 
policiesScroll.setSize(300,250); 

//JradioButons 
JRadioButton b1 = new JRadioButton("Company",false); 
JRadioButton b2 = new JRadioButton("Individual",false); 
JRadioButton b3 = new JRadioButton("Standard",false); 
JRadioButton b4 = new JRadioButton("Depreciable",false); 
JRadioButton b5 = new JRadioButton("Expirable",false); 

//ButtonGroups 
ButtonGroup clientsGroup = new ButtonGroup(); 
b1.setLocation(120, 70); 
b1.setSize(100,30); 
b2.setLocation(260, 70); 
b2.setSize(100,30); 
f.getContentPane().add(b2); 
f.getContentPane().add(b1); 
clientsGroup.add(b1); 
clientsGroup.add(b2); 


ButtonGroup policiesGroup = new ButtonGroup(); 
b3.setLocation(600, 10); 
b4.setLocation(600, 60); 
b5.setLocation(600, 110); 
b3.setSize(100,60); 
b4.setSize(100,60); 
b5.setSize(100,60); 
f.getContentPane().add(b3); 
f.getContentPane().add(b4); 
f.getContentPane().add(b5); 
policiesGroup.add(b3); 
policiesGroup.add(b4); 
policiesGroup.add(b5); 

//Jlabel 
JLabel label = new JLabel("Type:"); 
f.getContentPane().add(label); 
label.setLocation(30, 55); 
label.setSize(60,60); 

JLabel label2 = new JLabel("Type:"); 
f.getContentPane().add(label2); 
label2.setLocation(545, 10); 
label2.setSize(60,60); 
} 
} 

Answer 1

的問題是，JRadioButtons沒有被塗爲JFrame加入時，他們已經顯示。

你需要調用JFrame#setVisible後，你所有的組件添加到容器：

f.setVisible(true); 

旁白：不要使用絕對定位（null佈局），使用layout manager代替。使用佈局管理器不需要設置零件尺寸&位置。