ArrayList problem in Java

[navdeep]

consider-

String[] str1={"One"};

String[] str2={"One","Two"};

String[] str3={"One","Two", "Three"};

String[] str4={"One","Two", "Three", "Four"};

String[] str5={"One","Two", "Three", "Four","Five"};

 

ArrayList al=new ArrayList();

 

al.add(str1);

al.add(str2);

al.add(str3);

al.add(str4);

al.add(str5);

 

till now i have successfully added 5 arrays in the array list, al.. now i want to retrieve each element of each array..

 

if i use iterator-

Iterator itr=al.iterator();

while(itr.hasNext()) {

System.out.println("Element : "+itr.next());

}

 

i get-

Element : [Ljava.lang.String;@182f0db

Element : [Ljava.lang.String;@192d342

Element : [Ljava.lang.String;@6b97fd

Element : [Ljava.lang.String;@1c78e57

Element : [Ljava.lang.String;@5224ee

 

clearly, these are addresses of those 5 arrays, i dont want them, i want the elements, output should be-

One

One Two

One Two Three

One Two Three Four

One Two Three Four Five

 

so my question, how to retrieve them?

 

but i guess i can achieve this by using List and probably even achieve my goal but what if i only want the value "Three" from the array str3 that is now in al, how would i retrieve it?

 

desired output-

Value at 3rd position of al's 3rd element : Three

[Greg H.]

Off the cuff I would say

 

public static void main(String[] args) {
	String[] str1={"One"};
	String[] str2={"One","Two"};
	String[] str3={"One","Two", "Three"};
	String[] str4={"One","Two", "Three", "Four"};
	String[] str5={"One","Two", "Three", "Four","Five"};

	ArrayList<String[]> al=new ArrayList<String[]>();

	al.add(str1);
	al.add(str2);
	al.add(str3);
	al.add(str4);
	al.add(str5);

	String[] array = (String[]) al.get(2);
	System.out.print(array[2]);

}


Str 3, position 3 :Three

 

If you wanted to iterate over all of them you could do something like this:

public static void main(String[] args) {
	String[] str1={"One"};
	String[] str2={"One","Two"};
	String[] str3={"One","Two", "Three"};
	String[] str4={"One","Two", "Three", "Four"};
	String[] str5={"One","Two", "Three", "Four","Five"};

	ArrayList<String[]> al=new ArrayList<String[]>();

	al.add(str1);
	al.add(str2);
	al.add(str3);
	al.add(str4);
	al.add(str5);

	Iterator itr = al.iterator();
	while(itr.hasNext()){
		String[] array = (String[]) itr.next();
		for (int i = 0;i < array.length; i++){
			System.out.print(array[i] + " ");
		}
		System.out.print("\n");
	}

}

}

Output:

One 
One Two 
One Two Three 
One Two Three Four 
One Two Three Four Five 

[navdeep]

thanks 'Greg H.' for the prompt reply.. my problem is solved now..

 

but i figured one more way of iterating through the array list, thought i would share with you, it goes as follows:

 

import java.util.*;

class al {
public static void main(String nav[]) {
	String[] st1={"One"};
	String[] st2={"One", "Two"};
	String[] st3={"One", "Two", "Three"};
	String[] st4={"One", "Two", "Three", "Four"};
	String[] st5={"One", "Two", "Three", "Four", "Six"};

	ArrayList obj=new ArrayList();

	obj.addAll(Arrays.asList(st1, st2, st3, st4, st5));

	for(int i=0; i<obj.size(); i++)
		System.out.println(Arrays.toString((String[]) obj.get(i)));
}
}

 

Output-

[One]
[One, Two]
[One, Two, Three]
[One, Two, Three, Four]
[One, Two, Three, Four, Six]

 

thanking you again..

[Greg H.]

Happy to help.