import javax.swing.*; import javax.swing.border.EmptyBorder; import java.awt.*; import java.text.DecimalFormat; import java.util.regex.*; public class WeightIndex extends JFrame { private static final long serialVersionUID = 1L; private JPanel contentPane; private JLabel titleLabel; private JPanel contentPanel; private JButton submitButton; private ButtonGroup bg; private JPanel sexPanel; private JRadioButton ChinaRadio; private JRadioButton AsiaRadio; private JRadioButton WHORadio; private JPanel whPanel; private JLabel heightLabel; private JLabel weightLabel; private JTextField heightText; private JTextField weightText; private JPanel consolePanel; private JLabel consoleLabel; private JTextField consoleText;分析一下这段代码
时间: 2024-04-28 15:22:58 浏览: 11
这段代码定义了一个名为WeightIndex的Java类,继承了JFrame类。类中包含了一些Swing组件,如JPanel、JLabel、JButton、ButtonGroup、JRadioButton、JTextField等。这些组件被用来创建一个图形用户界面,用于计算体重指数。
JPanel组件是一个容器,用于组织和布局其他组件。JLabel组件用于显示文本标签,JButton组件用于创建按钮,ButtonGroup组件用于管理一组单选按钮,JRadioButton组件用于创建单选按钮,JTextField组件用于接收用户输入的文本。
这段代码还包括一些方法,用于初始化组件和设置界面布局等。其中,contentPane是一个面板容器,用于存放其他面板和组件,submitButtom是一个提交按钮,用于触发计算体重指数的操作。consoleLabel和consoleText用于显示计算结果和用户输入的数据。
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import javax.swing.*; import javax.swing.border.EmptyBorder; import java.awt.*; import java.text.DecimalFormat; import java.util.regex.*; public class WeightIndex extends JFrame { private static final long serialVersionUID = 1L; private JPanel contentPane; private JLabel titleLabel; private JPanel contentPanel; private JButton submitButton; private ButtonGroup bg; private JPanel sexPanel; private JRadioButton ChinaRadio; private JRadioButton AsiaRadio; private JRadioButton WHORadio; private JPanel whPanel; private JLabel heightLabel; private JLabel weightLabel; private JTextField heightText; private JTextField weightText; private JPanel consolePanel; private JLabel consoleLabel; private JTextField consoleText; 分析一下这段代码
这段代码定义了一个名为`WeightIndex`的类,继承自`JFrame`,表示一个窗口应用程序。其中,`serialVersionUID`是一个用于序列化的静态变量。
类中包含了一系列组件,如`contentPane`、`titleLabel`、`contentPanel`、`submitButton`、`bg`、`sexPanel`、`ChinaRadio`、`AsiaRadio`、`WHORadio`、`whPanel`、`heightLabel`、`weightLabel`、`heightText`、`weightText`、`consolePanel`、`consoleLabel`、`consoleText`,它们用于创建布局和显示UI界面。
在类中使用了Java的AWT和Swing库,其中包括了`JFrame`、`JPanel`、`JLabel`、`JButton`、`ButtonGroup`、`JRadioButton`、`JTextField`等组件,用于构建UI界面。
对于代码中的`JRadioButton`,通过将它们添加到同一个`ButtonGroup`中,可以实现单选按钮的互斥。
整个类的作用是实现一个体重指数计算器的UI界面,用户可以在界面上输入身高和体重数据,选择计算方法,然后通过点击提交按钮计算体重指数并显示结果。
java曲线自动生成系统_java生成曲线图
生成曲线图可以使用Java中的图形库,比如JFreeChart或者Chart.js。这些库提供了许多API可以用来生成各种类型的图表,包括曲线图。
以下是一个使用JFreeChart生成曲线图的示例代码:
```java
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Point;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.Year;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.GradientPaintTransformType;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;
import org.jfree.ui.StandardGradientPaintTransformer;
public class LineChartDemo extends ApplicationFrame {
public LineChartDemo(String title) {
super(title);
JFreeChart chart = createChart();
ChartPanel panel = new ChartPanel(chart);
panel.setPreferredSize(new Dimension(500, 270));
setContentPane(panel);
}
private JFreeChart createChart() {
TimeSeries series = new TimeSeries("Random Data");
Date date = new Date();
for (int i = 0; i < 100; i++) {
date = new Date(date.getTime() + 1000 * 60 * 60 * 24);
series.add(new Year(date), Math.random() * 100);
}
TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(series);
JFreeChart chart = ChartFactory.createXYLineChart(
"Line Chart Demo", // chart title
"Time", // x axis label
"Value", // y axis label
dataset, // data
PlotOrientation.VERTICAL,
true, // include legend
true, // tooltips
false // urls
);
chart.setBackgroundPaint(Color.white);
XYPlot plot = (XYPlot) chart.getPlot();
plot.setBackgroundPaint(Color.lightGray);
plot.setDomainGridlinePaint(Color.white);
plot.setRangeGridlinePaint(Color.white);
plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
plot.setDomainCrosshairVisible(true);
plot.setRangeCrosshairVisible(true);
XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
renderer.setSeriesLinesVisible(0, true);
renderer.setSeriesShapesVisible(0, false);
plot.setRenderer(renderer);
DateAxis axis = (DateAxis) plot.getDomainAxis();
axis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));
NumberAxis axis2 = (NumberAxis) plot.getRangeAxis();
axis2.setNumberFormatOverride(new DecimalFormat("#0.0"));
GradientPaint gp0 = new GradientPaint(
0.0f, 0.0f, Color.blue,
0.0f, 0.0f, new Color(0, 0, 64)
);
GradientPaint gp1 = new GradientPaint(
0.0f, 0.0f, Color.green,
0.0f, 0.0f, new Color(0, 64, 0)
);
renderer.setSeriesPaint(0, gp0);
renderer.setSeriesPaint(1, gp1);
renderer.setGradientPaintTransformer(
new StandardGradientPaintTransformer(GradientPaintTransformType.VERTICAL)
);
return chart;
}
public static void main(String[] args) {
LineChartDemo demo = new LineChartDemo("Line Chart Demo");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
}
```
这段代码使用JFreeChart库生成随机数据的曲线图。如果你有自己的数据,只需要修改相应的代码即可。