Java静态初始化块和对象初始化块

/**
 * 
 */
package freewill.initfiled;

import java.util.Random;

/**
 * @author freewill
 * 
 */
public class InitFiledBlockStatic {
	private static int nextId;
	private int id;
	private String name;

	public InitFiledBlockStatic() {

	}

	// static initialization block
	static {
		Random generator = new Random();
		nextId = generator.nextInt();
	}

	// object initialization block
	{
		id = nextId;
		nextId++;
	}

	public static void main(String[] args) {
		InitFiledBlockStatic a = new InitFiledBlockStatic();
		System.out.println(a.id);
		InitFiledBlockStatic b = new InitFiledBlockStatic();
		System.out.println(b.id);
	}
}