TestObject.java

import java.io.Serializable;
import java.nio.ByteBuffer;
import java.security.MessageDigest;

public class TestObject {
	int g;
	String h;
	int[] i;
	String[] j;

	public TestObject() {
		this.g = 0;
		this.h = "init";
		this.i = new int[]{0, 1, 2, 3};
		this.j = new String[] {"init", "init", "init", "init"};
	}

	public long hashClass() {
		StringBuilder sb = new StringBuilder( String.valueOf(this.g));
		sb.append(this.h);
		for(int _i: this.i) sb.append(_i);
		for(String _j: this.j) sb.append(_j);

		try {
			MessageDigest md = MessageDigest.getInstance("SHA");
			md.update(sb.toString().getBytes());
			byte[] results = md.digest();
			ByteBuffer bb = ByteBuffer.wrap(results, 0, 8);
			return bb.getLong();
		} catch(Exception e) {
			return -5566;
		}
	}

	public void randomGenerate() {
		this.g = (int)(Math.random() * 1000);
		this.h = String.valueOf(Math.random());
		for(int idx = 0; idx < this.i.length; idx++)
			this.i[idx] = (int)(Math.random() * 1000);
		for(int idx = 0; idx < this.j.length; idx++)
			this.j[idx] = String.valueOf(Math.random());
	}
}