import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class FontWin extends Frame implements ItemListener,ActionListener
{
Label lfont=new Label("字体:"),
lglyph=new Label("字形:"),
lsize=new Label("大小:"),
label=new Label(),
label_1 = new Label("预览:");
Button submit=new Button("确定"),
resert=new Button("取消");
TextField 字体=new TextField(),
字形=new TextField(),
大小=new TextField();
List list1=new List(7,false),
list2=new List(7,false),
list3=new List(7,false);
Font f;
FontWin(String s)
{
super(s);
setResizable(false);
setBounds(100, 100, 486,475); Panel panel = new Panel();
panel.setLayout(null);
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
String fontName[]=ge.getAvailableFontFamilyNames();
String[] fontGlyph={"常规","斜体","粗体","粗斜体"};
String[] fontSize={"8","9","10","11","12","14","16","18","20","22","24","26","28","36","48","72"};
for(int i=0;i<fontName.length;i++)
{
list1.add(fontName[i]);
}
for(int i=0;i<fontGlyph.length;i++)
{
list2.add(fontGlyph[i]);
}
for(int i=0;i<fontSize.length;i++)
{
list3.add(fontSize[i]);
}
lfont.setBounds(10, 11, 35, 20);
panel.add(lfont);
字体.setBounds(10, 32, 120, 21);
panel.add(字体);
list1.setBounds(10,54,120,200);
panel.add(list1);
lglyph.setBounds(151, 11, 35, 20);
panel.add(lglyph);
字形.setBounds(151, 32, 120, 21);
panel.add(字形);
list2.setBounds(151,54,120,200);
panel.add(list2);
label_1.setBounds(151, 255, 35, 20);
panel.add(label_1);
label.setBounds(151, 271, 207, 63);
label.setBackground(new Color(255, 255, 255));
label.setText("字体样式 AaBbCc");
label.setBackground(Color.green);
panel.add(label);
lsize.setBounds(285, 12, 35, 20);
panel.add(lsize);
大小.setBounds(285, 32, 73, 21);
panel.add(大小);
list3.setBounds(285,54,120,200);
panel.add(list3);
submit.setBounds(154, 340, 100, 25);
submit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
setVisible(false);
}
});
panel.add(submit);
resert.setBounds(258, 340, 100, 25);
panel.add(resert);
add(panel, BorderLayout.CENTER);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}); //关闭窗口事件
list1.addItemListener(this);
list2.addItemListener(this);
list3.addItemListener(this);
submit.addActionListener(this);
resert.addActionListener(this);
setVisible(true);
validate();
}
public void itemStateChanged(ItemEvent e)
{
String name=list1.getSelectedItem();
String style=list2.getSelectedItem();
String size=list3.getSelectedItem();
字体.setText(name);
字形.setText(style);
大小.setText(size);
int intstyle=0;
int intSize = Integer.parseInt(size);
if(style.equals("常规"))
intstyle=Font.PLAIN;
if(style.equals("粗体"))
intstyle=Font.BOLD;
if(style.equals("斜体"))
intstyle=Font.ITALIC;
if(style.equals("粗斜体"))
intstyle=Font.BOLD+Font.ITALIC;
f = new Font("name",intstyle,intSize);
label.setFont(f);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==resert)
System.exit(0);
}
}
public class w2
{
public static void main(String[] args)
{
FontWin f=new FontWin("字体");
}
}
import java.awt.event.*;
import javax.swing.*;
class FontWin extends Frame implements ItemListener,ActionListener
{
Label lfont=new Label("字体:"),
lglyph=new Label("字形:"),
lsize=new Label("大小:"),
label=new Label(),
label_1 = new Label("预览:");
Button submit=new Button("确定"),
resert=new Button("取消");
TextField 字体=new TextField(),
字形=new TextField(),
大小=new TextField();
List list1=new List(7,false),
list2=new List(7,false),
list3=new List(7,false);
Font f;
FontWin(String s)
{
super(s);
setResizable(false);
setBounds(100, 100, 486,475); Panel panel = new Panel();
panel.setLayout(null);
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
String fontName[]=ge.getAvailableFontFamilyNames();
String[] fontGlyph={"常规","斜体","粗体","粗斜体"};
String[] fontSize={"8","9","10","11","12","14","16","18","20","22","24","26","28","36","48","72"};
for(int i=0;i<fontName.length;i++)
{
list1.add(fontName[i]);
}
for(int i=0;i<fontGlyph.length;i++)
{
list2.add(fontGlyph[i]);
}
for(int i=0;i<fontSize.length;i++)
{
list3.add(fontSize[i]);
}
lfont.setBounds(10, 11, 35, 20);
panel.add(lfont);
字体.setBounds(10, 32, 120, 21);
panel.add(字体);
list1.setBounds(10,54,120,200);
panel.add(list1);
lglyph.setBounds(151, 11, 35, 20);
panel.add(lglyph);
字形.setBounds(151, 32, 120, 21);
panel.add(字形);
list2.setBounds(151,54,120,200);
panel.add(list2);
label_1.setBounds(151, 255, 35, 20);
panel.add(label_1);
label.setBounds(151, 271, 207, 63);
label.setBackground(new Color(255, 255, 255));
label.setText("字体样式 AaBbCc");
label.setBackground(Color.green);
panel.add(label);
lsize.setBounds(285, 12, 35, 20);
panel.add(lsize);
大小.setBounds(285, 32, 73, 21);
panel.add(大小);
list3.setBounds(285,54,120,200);
panel.add(list3);
submit.setBounds(154, 340, 100, 25);
submit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
setVisible(false);
}
});
panel.add(submit);
resert.setBounds(258, 340, 100, 25);
panel.add(resert);
add(panel, BorderLayout.CENTER);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}); //关闭窗口事件
list1.addItemListener(this);
list2.addItemListener(this);
list3.addItemListener(this);
submit.addActionListener(this);
resert.addActionListener(this);
setVisible(true);
validate();
}
public void itemStateChanged(ItemEvent e)
{
String name=list1.getSelectedItem();
String style=list2.getSelectedItem();
String size=list3.getSelectedItem();
字体.setText(name);
字形.setText(style);
大小.setText(size);
int intstyle=0;
int intSize = Integer.parseInt(size);
if(style.equals("常规"))
intstyle=Font.PLAIN;
if(style.equals("粗体"))
intstyle=Font.BOLD;
if(style.equals("斜体"))
intstyle=Font.ITALIC;
if(style.equals("粗斜体"))
intstyle=Font.BOLD+Font.ITALIC;
f = new Font("name",intstyle,intSize);
label.setFont(f);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==resert)
System.exit(0);
}
}
public class w2
{
public static void main(String[] args)
{
FontWin f=new FontWin("字体");
}
}
是 name 不是 “name”
字形=new TextField(),
大小=new TextField();
内容初始化为空。
一开始选择时会抛出 NPE
给你调了一下。。你报错是没有初始化。。字形,字体,,大小。。package com.test.exam;import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.Label;
import java.awt.List;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;public class TxtTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
FontWin f = new FontWin("字体");
}
}class FontWin extends Frame implements ItemListener, ActionListener {
Label lfont = new Label("字体:"),
lglyph = new Label("字形:"),
lsize = new Label("大小:"),
label = new Label(),
label_1 = new Label("预览:");
Button submit = new Button("确定"), resert = new Button("取消");
TextField 字体 = new TextField(), 字形 = new TextField(), 大小 = new TextField();
List list1 = new List(7, false), list2 = new List(7, false),
list3 = new List(7, false);
Font f; FontWin(String s) {
super(s);
setResizable(false);
setBounds(100, 100, 486, 475); Panel panel = new Panel();
panel.setLayout(null);
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
String fontName[] = ge.getAvailableFontFamilyNames();
String[] fontGlyph = { "常规", "斜体", "粗体", "粗斜体" };
String[] fontSize = { "8", "9", "10", "11", "12", "14", "16", "18",
"20", "22", "24", "26", "28", "36", "48", "72" };
for (int i = 0; i < fontName.length; i++) {
list1.add(fontName[i]);
}
for (int i = 0; i < fontGlyph.length; i++) {
list2.add(fontGlyph[i]);
}
for (int i = 0; i < fontSize.length; i++) {
list3.add(fontSize[i]);
}
lfont.setBounds(10, 11, 35, 20);
panel.add(lfont);
字体.setBounds(10, 32, 120, 21);
panel.add(字体);
list1.setBounds(10, 54, 120, 200);
panel.add(list1);
lglyph.setBounds(151, 11, 35, 20);
panel.add(lglyph);
字形.setBounds(151, 32, 120, 21);
panel.add(字形);
list2.setBounds(151, 54, 120, 200);
panel.add(list2);
label_1.setBounds(151, 255, 35, 20);
panel.add(label_1);
label.setBounds(151, 271, 207, 63);
label.setBackground(new Color(255, 255, 255));
label.setText("字体样式 AaBbCc");
label.setBackground(Color.green);
panel.add(label);
lsize.setBounds(285, 12, 35, 20);
panel.add(lsize);
大小.setBounds(285, 32, 73, 21);
panel.add(大小);
list3.setBounds(285, 54, 120, 200);
panel.add(list3);
submit.setBounds(154, 340, 100, 25);
submit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
setVisible(false);
}
});
panel.add(submit);
resert.setBounds(258, 340, 100, 25);
panel.add(resert);
add(panel, BorderLayout.CENTER);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}); // 关闭窗口事件
list1.addItemListener(this);
list2.addItemListener(this);
list3.addItemListener(this);
submit.addActionListener(this);
resert.addActionListener(this);
setVisible(true);
validate();
} public void itemStateChanged(ItemEvent e) {
String name = "宋体"; // 初始样式
int intstyle = Font.PLAIN; // 初始字形
int intSize = 12; //初始字体大小
if(list1.getSelectedItem() != null){
name = list1.getSelectedItem();
字体.setText(name);
}
if(list2.getSelectedItem() != null){
String style = list2.getSelectedItem();
字形.setText(style);
if (style.equals("常规"))
intstyle = Font.PLAIN;
if (style.equals("粗体"))
intstyle = Font.BOLD;
if (style.equals("斜体"))
intstyle = Font.ITALIC;
if (style.equals("粗斜体"))
intstyle = Font.BOLD + Font.ITALIC;
}
if(list3.getSelectedItem() != null){
intSize = Integer.parseInt(list3.getSelectedItem());
大小.setText(String.valueOf(intSize));
}
f = new Font(name, intstyle, intSize);
label.setFont(f);
} public void actionPerformed(ActionEvent e) {
if (e.getSource() == resert)
System.exit(0);
}
}