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public class Human {

	int id;
	String name="";
	int amount;
	
	void work() {
		System.out.println(this.name+" is working...");
		this.amount+=100;
	}
}

	public static void main(String[] args) {
		Human zs=new Human();
		zs.name="张三";
		System.out.println(zs.amount);
		zs.work();
		System.out.println(zs.amount);
		
		Human ls=new Human();
		ls.name="李四";
		System.out.println(ls.amount);
		ls.work();
		System.out.println(ls.amount);
	}

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原文地址：http://my.oschina.net/u/559752/blog/424499