JAVAで始めようオブジェクト指向

/**
@auhtor kenji nagano
*/
class Person {
	Weather _weather ;
	public Person(Weather weather){
		_weather = weather ;
	}
	public void doneUmbrella(){
		_weather.doneUmbrella() ;
	}
	public void doneParasol(){
		_weather.doneParasol() ;
	}
	
}
interface Weather {
	void doneUmbrella() ;
	void doneParasol() ;
}

class  Rainny implements Weather{
	private String _state ;
	public Rainny(String state){
		_state = state ;
	}
	public String toString(){
		return '天気は雨です。' ;
	}
	
	public boolean equals(Object other){
		if(other instanceof Rainny){
			Rainny target = (Rainny)other ;
			if(target.getState().equals(_state)){
				return true ;
			}else{
				return false ;
			}
		}else{
			return false ;
		}
	}	
	public String getState(){return _state ;}
	public void doneUmbrella(){
		System.out.println('傘をさしています。') ;
	}
	public void doneParasol() {
		System.out.println('日傘なんていりません。') ;
	}

}

class Clear implements Weather{
	private String _state ;
	public Clear(String state){
		_state = state ;
	}

	public String toString(){
		return '天気は晴れです。'  ;
	}
	
	public boolean equals(Object other){
		if(other instanceof Clear){
			Clear target = (Clear)other ;
			if(target.getState().equals(_state)){
				return true ;
			}else{
				return false ;
			}
		}else{
			return false ;
		}
	}
	public String getState(){return _state ;}
	public void doneUmbrella(){
		System.out.println('傘なんていりません。') ;
	}
	public void doneParasol() {
		System.out.println('日傘が必要です。') ;
	}

}
class Cloudy implements Weather{
	private String _state ;
	Cloudy(String state){
		_state = state ;
	}
	public String toString(){
		return '天気は曇りです。';
	}
	public boolean equals(Object other){
		if(other instanceof Cloudy){
			Cloudy target = (Cloudy)other ;
			if(target.getState().equals(_state)){
				return true ;
			}else{
				return false ;
			}
		}else{
			return false ;
		}
	}	
	public String getState(){return _state ;}
	public void doneUmbrella(){
		System.out.println('たぶん傘は必要ないでしょう。') ;
	}
	public void doneParasol() {
		System.out.println('たぶん日傘は必要ないでしょう。') ;
	}


}

public class StatePtnClient{
	public static void main(String[] args){
		
		if(args.length != 1){
			System.out.println('usage : java 1 or 2 or 3') ;
			System.exit(0) ;
		}
		Weather weather = null;
		
		Person person = null ;
		
		switch(Integer.valueOf(args[0])){
			case 1 : {person = new Person(new Clear('clear')) ; break ;}
			case 2 : {person = new Person(new Cloudy('cloudy')) ; break ;}
			case 3 : {person = new Person(new Rainny('rainny')) ; break ;}
			default  : {
	           			System.out.println('usage : java 1 or 2 or 3') ;
						System.exit(0) ;}
		
		}
		person.doneUmbrella() ;
		person.doneParasol() ;
		
	}
}