for(Int t: int) in Java
for(FPTree childt: child) 的意思是吧FPTree类的所有child赋值给childt,!!!增强的for循环!!!
例如: String s=new ArrayList<String>();
s.add("FP-Growth is very hard");
s.add("But it's powerful");
for(string temps: s){
System.out.println(temps);}
输出结果为: FP-Growth is very hard
But it's powerful.

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