application1.java

来自「提供了常用的JAVA技术的示例」· Java 代码 · 共 33 行

package ifelse;

import javax.swing.UIManager;
import java.awt.*;
import java.io.*;

public class Application1 {

  //Main method
  public static void main(String[] args) throws IOException{
    InputStreamReader ir;
    BufferedReader in;
    ir=new InputStreamReader(System.in);
    in=new BufferedReader(ir);
    System.out.println("input x is :");
    String s=in.readLine();
    double x=Double.parseDouble(s);

    if (x==3.1415926)
      System.out.println("this number is π");
    else if(x==2071828183)
      System.out.println("this number is e");
    else
      System.out.println("neither π nor e ");
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new Application1();
  }
}