反射(3)クラスの属性の反射を理解し,次の属性があればReflectPointのstr内のa->z

public class ReflectPoint {
	private int x;
	public int y;
	public String str1="ball";
	public String str2="basketball";
	public String str3="itcast";
	public ReflectPoint(int x, int y) {
		super();
		this.x = x;
		this.y = y;
	}
	@Override
	public String toString() {
		return "ReflectPoint [str1=" + str1 + ", str2=" + str2 + ", str3="
				+ str3 + ", x=" + x + ", y=" + y + "]";
	}

}

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public static void changStringValue(Object object) throws IllegalArgumentException, IllegalAccessException{
		Field[] fields=object.getClass().getDeclaredFields();
		for(Field field:fields){
			if(field.getType()==String.class){
				String oldStr=(String)field.get(object);
				String newValue=oldStr.replace('b', 'm');
				field.set(object,newValue);// set ， ， 
			}
		}
	}

main関数の内容は次のとおりです.

		ReflectPoint reflectPoint=new ReflectPoint(3,5);
		changStringValue(reflectPoint);
		System.out.println(reflectPoint);