#There is no length() method for arrays in Java, only the length attribute. Array array.length returns the length of the array.
String has a length() method, and str.length() returns the length of the string. (Recommended learning:java course)
size() is for generic collections and is used to calculate the object size. Check the generics How many elements.
public static void main(String[] args) { String []list={"ma","cao","yuan"}; String a="macaoyuan"; System.out.println(list.length); 数组长度是3 System.out.println(a.length()); 字符串长度是9 List
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