Usando Vetor e Pthreads

import java.util.Vector;

import javax.swing.JOptionPane;


public class vetor extends Thread {

	public vetor(int[] a, int p) {
		super();
		this.a = a;
		this.p = p;
	}
	/**
	 * @param args
	 */
	private int a[] = new int[10];
	private int p;

	public void procurar(){
		for(int k = 0; k<10; k++){
			a[k] = (int)(Math.random()*100);
			System.out.println(a[k]+" = "+k);
		}
	}
	public void imprimir(){
		for(int k = 0; k<10; k++){
			if(a[k] == p){
				JOptionPane.showMessageDialog(null, "o valor encontrado eh: "+a[k]+" na posicao "+k);
				}	
			}
	}
	public static void main(String[] args)  {
		// TODO Auto-generated method stub
		
		int x = 0, p = 0;
		int[] c = new int [x];
		vetor[] t = new vetor [c.length] ;
		for(int i = 0;i<t.length;i++){
			t[i].procurar();
			t[i].start();
			p = Integer.parseInt(JOptionPane.showInputDialog("Digite o numero que deseja buscar "));
			try {
				t[i].join();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			}
		for(int j = 0;j<t.length;j++){
			t[j].imprimir();
			//t[j].start();
			try {
				t[j].join();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			}
	}
}