How can I store a method in a variable in Java 8?

Question

Is it possible to store a method into a variable? Something like

 public void store() {
     SomeClass foo = ;
     //...
     String          


        

Answer 1

Maybe you can try java.util.stream from Java 8

public class Item {

    public Item(int id, String title, String language){
        this.id=id;
        this.title=title;
        this.language=language;
    }

    private int id;
    private String title;
    private String language;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getLanguage() {
        return language;
    }

    public void setLanguage(String language) {
        this.language = language;
    }
}

The following code snippet shows how to filter the data by stream:

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class Test {
    public static void main(String[] args) {

        List items = new ArrayList();
        items.add(new Item(1, "t1", "english"));
        items.add(new Item(2, "t2", "english"));
        items.add(new Item(3, "t3", "Japanese"));
        
        // get items 1 and 2
        List result1 = items.stream()
                .filter(n->n.getLanguage()=="english")
                .collect(Collectors.toList());

        // get item 1
        Item result2 = items.stream()
                .filter(n->n.getId()==1)
                .findFirst().orElse(null);
    }

}