importjava.util.HashMap;importjava.util.Map;publicclassGJJJjjj{publicstaticvoidmain(String[]args){//随机生成字符串StringBuffersb=newStringBuffer();for(inti=0;i<25;i++){sb.append((char)((int)(Math.random()*('Z'-'A'))+'A'));}for(inti=0;i<25;i++){sb.append((char)((int)(Math.random()*('z'-'a'))+'a'));}//打印字符串System.out.println(sb.toString());//统计Map<Character,Integer>map=newHashMap<Character,Integer>();for(inti=0,l=sb.length();i<l;i++){charc=sb.charAt(i);Integerv=map.get(c);if(null==v){map.put(c,1);}else{map.put(c,v+1);}}//输出统计结果for(Map.Entry<Character,Integer>entry:map.entrySet()){System.out.println(entry.getKey()+":"+entry.getValue());}}}
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