java程序一步一步学习4

public class DataOnly2 {int i;float f;boolean b;public static void main(String[] args){DataOnly2 d = new DataOnly2();d.i = 68;System.out.println("d.i = " + d.i);d.f = 1.1f;System.out.println("d.f = " + d.f);d.b = false;System.out.println("d.b = " + d.b);}}