
public class ListaPR {
	PullRequest first;
	
	public ListaPR() {
		first = new PullRequest(null);
	}
	
	public void insertarPR(String t) {
		
	}
	
	public int getSize() {
		
		
		return 0;
	}
	
	public boolean isEmpty() {
		//...
		return false;
	}
}


public class ListaPR {
	PullRequest first;
	
	public ListaPR() {
		first = new PullRequest(null);
	}
	
	public void insertarPR(String t) {
		this.t=t;
	}
	
	public int getSize() {
		return size;
	}
	
	public boolean isEmpty() {
		//...
		return false;
	}
}

Update ListaPR.java