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package JavaCollection; import java.util.ArrayList; import java.util.Scanner; public class NumbersArrayList { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter total number of lines:"); int lines = scanner.nextInt(); ArrayList<ArrayList<Integer>> rows = new ArrayList<>(); for (int i = 0; i < lines; i++) { System.out.print("Enter the number of elements for line " + (i + 1) + ":"); int numElements = scanner.nextInt(); //if(numElements!=0) { ArrayList<Integer> row = new ArrayList<>(); System.out.print("Enter the elements for line " + (i + 1) + ":"); for (int j = 0; j < numElements; j++) { int element = scanner.nextInt(); row.add(element); } // System.out.println(row); rows.add(row); //} } System.out.println(rows); System.out.print("Enter the no of queries:"); int queryCount = scanner.nextInt(); for (int m = 1; m <= queryCount; m++) { System.out.print("Enter the line to be fetched:"); int queryLine = scanner.nextInt(); System.out.print("Enter the position to be fetched:"); int queryPosition = scanner.nextInt(); System.out.println("line size:" + rows.get(queryLine - 1).size()); if (queryPosition - 1 < rows.get(queryLine - 1).size()) { System.out.println(rows.get(queryLine - 1).get(queryPosition - 1)); } else { System.out.println("ERROR!"); } } } }
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