求数组
int[] a = {1,2,3};
a.length;
求集合
用a.size()
我搞错过了,希望下次不会再错
int[] a ={1,2,3}; System.out.println(a.length); List aList = new ArrayList(); aList.add("1"); aList.add("2"); System.out.println(aList.size());
结果
3
2
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