类型 | 长度取值方法或属性 | 示例 |
数组 Array | length | String[] a = {"1","2","3"}; System.out.println(a.length); |
字符串 String | length() | String a = "1212121212"; System.out.println(a.length()); |
集合 List | size() | List a1 = new ArrayList(); System.out.println(a1.size()); |
~不喜欢篮球的摄影师不是一个好程序员~