java练习--货船问题

针对java的异常处理机制的练习

public class CargoBoat {
	//装载的重量
	int realContent;
	//最大的装载量
	int maxContent;
	public void setMaxContent(int c){
		maxContent=c;
	}
	public void loading (int m)throws DangerException{
		realContent+=m;
		if(realContent>maxContent){
			realContent-=m;
			throw new DangerException();
		}
		System.out.println("目前装载了"+realContent+"吨货物。");
	}
	
	
}

public class DangerException  extends Exception{
	final String message="超重";
	public String warnMess(){
		return message;
	}

}

测试类：

public class test {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		CargoBoat ship=new CargoBoat();
		ship.setMaxContent(1000);
		int m=600;
		try{
			ship.loading(m);
			m=400;
			ship.loading(m);
			m=367;
			ship.loading(m);
			m=555;
			ship.loading(m);
			
		}catch(DangerException e){
			System.out.println(e.warnMess());
			System.out.println("无法在装载的重量是"+m+"吨");
		}
		finally{
			System.out.print("货船将正点起航！");
		}
	}

}

输出结果：