t8_2_random_run.java

多个java程序

public class T8_2_random_run {
	 public static void main(String[] args){
		 String [][]c=new String[5][20];
		 int []count=new int [26];
		 int i=0;
		 for(i=0;i<26;i++)count[i]=0;
		 int k=0;
		 for(k=0;k<5;k++){
			 for(i=0;i<20;i++){
				 double t=Math.random();
				 int it=(int)Math.round(t*25);
				 switch (it){
				 case 0:c[k][i]="a";count[0]++;break;
				 case 1:c[k][i]="b";count[1]++;break;
				 case 2:c[k][i]="c";count[2]++;break;
				 case 3:c[k][i]="d";count[3]++;break;
				 case 4:c[k][i]="e";count[4]++;break;
				 case 5:c[k][i]="f";count[5]++;break;
				 case 6:c[k][i]="g";count[6]++;break;
				 case 7:c[k][i]="h";count[7]++;break;
				 case 8:c[k][i]="i";count[8]++;break;
				 case 9:c[k][i]="j";count[9]++;break;
				 case 10:c[k][i]="k";count[10]++;break;
				 case 11:c[k][i]="l";count[11]++;break;
				 case 12:c[k][i]="m";count[12]++;break;
				 case 13:c[k][i]="n";count[13]++;break;
				 case 14:c[k][i]="o";count[14]++;break;
				 case 15:c[k][i]="p";count[15]++;break;
				 case 16:c[k][i]="q";count[16]++;break;
				 case 17:c[k][i]="r";count[17]++;break;
				 case 18:c[k][i]="s";count[18]++;break;
				 case 19:c[k][i]="t";count[19]++;break;
				 case 20:c[k][i]="u";count[20]++;break;
				 case 21:c[k][i]="v";count[21]++;break;
				 case 22:c[k][i]="w";count[22]++;break;
				 case 23:c[k][i]="x";count[23]++;break;
				 case 24:c[k][i]="y";count[24]++;break;
				 case 25:c[k][i]="z";count[25]++;break;
				 default:break;
				 }
			 }
		 }
		 int j=0;
		 for(i=0;i<5;i++)
			 for(j=0;j<20;j++)
				 System.out.print(c[i][j]+" ");
		 System.out.println("");
		 
		 System.out.println("从a到z的出现次数（频率）依次为：");
		 for(i=0;i<26;i++){
			 System.out.print(count[i]+" ");
		 }
		
	 }
}