Does Java array have length method?

#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<Object> array=new ArrayList();
    array.add(a);
    System.out.println(array.size());       泛型中对象个数是1
}

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