如何在Java中将对象添加到ArrayList

如何在Java中将对象添加到ArrayList

new

创建对象时需要使用运算符

Contacts.add(new Data(name, address, contact)); // Creating a new object and adding it to list - single step

要不然

Data objt = new Data(name, address, contact); // Creating a new objectContacts.add(objt); // Adding it to the list

并且您的构造函数不应包含

void

。否则它将成为您班上的一个方法。

public Data(String n, String a, String c) { // Constructor has the same name as the class and no return type as such