java实现随机数生成器

package src;

public class application {

  public static void main(string[] args) {

  windowboxlayout win= new windowboxlayout();

  win.setbounds( 100 , 200 , 300 , 350 );

  win.settitle( "随机数生成器" );

  win.setvisible( true );

  }

}

package src;

import java.awt.event.actionevent;

import java.awt.event.actionlistener;

import java.util.random;

import javax.swing.*;

public class randomlistener implements actionlistener{

  jtextfield text1;

  jtextarea text2;

  random random= new random();

  int result= 0 ;

  public void setjtextfield(jtextfield t){

  text1=t;

  }

  public void setjtextarea(jtextarea t){

  text2=t;

  }

  @override

  public void actionperformed(actionevent e) {

  try {

  text2.settext( "" );

  integer number=integer.parseint(text1.gettext());

  result=random.nextint(number)+ 1 ;

  text2.append(result+ "" );

  }

  catch (exception exp){

  text2.append( "请输入数字字符" );

  }

  }

}

package src;

import javax.swing.*;

public class windowboxlayout extends jframe{

  /**

  *

  */

  private static final long serialversionuid = 1l;

  box basebox;

  jtextfield text1;

  jtextarea text2;

  jbutton button;

  randomlistener random;

  public windowboxlayout(){

  setlayout( new java.awt.flowlayout());

  init();

  setvisible( true );

  setdefaultcloseoperation(jframe.exit_on_close);

  }

  void init(){

  basebox=box.createverticalbox();

  basebox.add( new jlabel( "请输入随机数的最大范围值：" ));

  basebox.add(box.createverticalstrut( 8 ));

  text1= new jtextfield( 5 );

  basebox.add(text1);

  basebox.add(box.createverticalstrut( 8 ));

  button= new jbutton( "确定" );

  basebox.add(box.createverticalstrut( 8 ));

  basebox.add(button);

  text2= new jtextarea( 6 , 12 );

  basebox.add(box.createverticalstrut( 18 ));

  basebox.add(text2);

  add(basebox);

  random= new randomlistener();

  random.setjtextfield(text1);

  random.setjtextarea(text2);

  button.addactionlistener(random);

  }

}