是否可以将CustomObject []转换为String []而无需迭代？

Question

I have a custom object:

public class Cat {
    private String mName;
    private int mAge;

    public Cat(String name, int age) {
        mName = name;
        mAge = age;
    }

    @Override
    public String toString() {
        return mName;
    }
}

I need to get String[] with names from Cat[]. It it possible? How to get it?

Answer 1

As assylias wrote in the comments - you will iterate it one way or another, that said, if you don't want to explicitly iterate it - you can use Arrays.toString :

Cat[] catArray = ...
String catArrayStr = Arrays.toString(catArray);

Answer 2

考虑使用延迟评估的Google Guava的transform ，因此在使用时仅迭代一次。