java：产生小数位数为2的随机概率，使得和为1

public static List<InstSec> setDataSec(List<String> instno) {List<InstSec> result = new ArrayList<InstSec>();String[] mon ={"2014-01","2014-02","2014-03","2014-04"};int[] flag ={1,2,3,4,5};List<String> instnosub5 = new ArrayList<String>();for(int i=0;i<instno.size();i++){if(!instnosub5.contains(instno.get(i).substring(0,5))){instnosub5.add(instno.get(i).substring(0,5));}}//对于每个organValue，每个月，都有五个等级，对应flag propfor(int i=0;i<instnosub5.size();i++){for(int j=0;j<mon.length;j++){float[] prop = genProp();//注意：在此处产生随机概率for(int k=0;k<flag.length;k++){InstSec inst=new InstSec();inst.setInst_no_sub5(instnosub5.get(i));inst.setSa_tx_m(mon[j]);inst.setFlag(flag[k]);inst.setProp(prop[k]);result.add(inst);}}}return result;}public static float[] genProp(){//产生概率随机数，且让和为1float[] prop =new float[5];int[] randInt =new int[5];int sum=0;for(int i=0;i<5;i++){randInt[i]=1+(int)(Math.random()*10);sum+=randInt[i];}
DecimalFormat dF=new DecimalFormat(".00");float sumprop=0;for(int i=0;i<5;i++){prop[i]= Float.parseFloat(dF.format(1.0*randInt[i]/sum));//System.out.println("prop is "+prop[i]);sumprop+=prop[i];}//System.out.println("sumprop is "+sumprop);sumprop=Float.parseFloat(dF.format(sumprop));if(sumprop<1)prop[4]+=1-sumprop;elseprop[4]-=sumprop-1;//System.out.println("prop[4] is "+prop[4]);return prop;}