Random用法随机获取数字.doc

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1、Random用法1、获取固定几个字母中任意一个组成一个6位数字输出publicclassRandomUI{privatestaticRandomrandom=newRandom();//随机产生对象的对象privatestaticStringgetRandomNumber(Stringrange[],intrangLength,intlength){StringBufferbs=newStringBuffer();//因为bs可以直接把内容拼起来for(inti=0;i

2、andom.nextInt(rangLength)随机获取0-9之间的任何数字//range[random.nextInt(rangLength)]找到数组中对应的值//比如random.nextInt(rangLength)=1，range[1]=B;bs.append(String.valueOf(range[random.nextInt(rangLength)]));}returnbs.toString();//返回值}publicstaticvoidmain(String[]args){//T

3、ODOAuto-generatedmethodstubString[]range={"A","B","C","D","E","F","G","H","J","P"};System.out.println("range="+RandomUI.getRandomNumber(range,10,5));//因为是静态方法所以直接类名.方法名}}1、获取数字与字母组合的随机数字将publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubS

4、tring[]range={"A","B","C","D","E","F","G","H","J","P"};System.out.println("range="+RandomUI.getRandomNumber(range,10,5));//因为是静态方法所以直接类名.方法名}修改为publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubString[]range={"A","B","C","D","E","F","2","

5、3","4","7"};System.out.println("range="+RandomUI.getRandomNumber(range,10,5));//因为是静态方法所以直接类名.方法名}运行就可以了;2、直接获取0-9或10-99或..的方法privatestaticRandomrandom=newRandom();//随机产生对象的对象inti=10;intii=random.nextInt(i);System.out.println(“ii=”+ii);如果要打印100以内随机数字，只需

6、修改i的值为100就可以了，后面依次类推;