我想让代码得到这个输出：lee [2]，rebok [2];

Question

ArrayList arrayList = new ArrayList(); 
arrayList.add("lee"); 
arrayList.add("lee"); 
arrayList.add("rebok"); 
arrayList.add("rebok"); 

Set set = new LinkedHashSet(arrayList); 

我想要的代码来获得此输出：

lee[2],rebok[2]; 

Answer 1

使用guava Multiset计数

final StringBuilder out = new StringBuilder(); 
final Multiset<String> count = HashMultiset.create(arrayList); // your arraylist 
for (final String key : count.elementSet()) { 
    out.append(key).append('[').append(count.count(key)).append("],"); 
} 
// we need to remove a possible trailing comma 
System.out.println(out.length() > 0 ? out.substring(0, out.length() - 1) : ""); 

输出：

lee[2],rebok[2]