输入输出流 package chap1; //: c02:DataOnlyTest.java // From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002 // www.BruceEckel.com. See copyright notice in CopyRight.txt. class DataOnly { int i; float f; boolean b; } public class DataOnlyTest { public static void main(String[] args) { DataO