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■ 例外表現とprivate、public　実例　---　java.awt.Colorクラスを概観してみる
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package mycolor;

public class Color{
	//不適切な数字をクラス外から代入されないようにprivate
	private int red;//0〜255
	private int green;//0〜255
	private int blue;//0〜255
	
	public static final Color black = new Color(0,0,0);
	public static final Color white = new Color(255,255,255);

	public Color(int red, int green, int blue){
		super();
		if(testColorValueRange(red, green, blue)){
			this.red = red;
			this.green = green;
			this.blue = blue;
		}
	}
	
	private static boolean testColorValueRange(int red, int green, int blue){
		if(0<=red && red<=255 && 
		   0<=green && green<=255 &&
		   0<=blue && blue<=255 ){
			return true;
		}else{
			throw new IllegalArgumentException("色調の数字は0から255の間で設定してください");
		}
	}
	
	public static void main(String[] args){
		Color c1 = new Color(-10,0,0);
	}
}