Juncao de valores

import javax.swing.JOptionPane;

class Exercicio5 {
	public static void main(String arg[]) {
		int A[] = new int[5];
		int B[] = new int[5];
		int C[] = new int[5];
		int D[] = new int [15];
		
		                   
		    for (int i = 0; i < 5; i++) {
			String a = JOptionPane.showInputDialog(null, "Digite o valor A ["+ i + "]");
			A[i] = Integer.parseInt(a);
		    }

			for (int i = 0; i < 5; i++) {
			String b = JOptionPane.showInputDialog(null, "Digite o valor B ["+ i + "]");
			B[i] = Integer.parseInt(b);
			}


			for (int i = 0; i < 5; i++) {
			String c = JOptionPane.showInputDialog(null, "Digite o valor C ["+ i + "]");
			C[i] = Integer.parseInt(c);
			}

		for (int i = 0; i < 5; i++) {
			D[i * 2] = A[i];
			D[i * 2 + 1] = B[i];
			D[i * 2 + 2] = C [i];
		}
		String saida ="";
		for (int i = 0; i < 15; i++) {
			saida += "D[" +i+ "] =" + D[i] + "\n";			
		}
		JOptionPane.showMessageDialog(null,saida);
	}
}