java會給成員變量賦初始值
不會給局部變量賦初始值

public?class?InitailPhone?{
	String?var?=?"成員變量";
	void?func(){
		String?var?=?"局部變量";
		System.out.println(var);
		System.out.println(this.var);//訪問成員變量時用this
	}

	public?static?void?main(String[]?args){
		Telphone?phone?=?new?Telphone();
		phone.screan?=?14.5f;
		phone.call();
		phone.sendMessage();
		InitailPhone?tphone?=?new?InitailPhone();
		tphone.func();
	}

}