public class Test2 { public void add(Byte b) { b = b++; } public void test() { Byte a = 127; Byte b = 127; add(++a); System.out.println("a = "+a); add(b); System.out.println("b = "+b); } public static void main(String[] args) { Test2
建议26:提防包装类型的null值 我们知道Java引入包装类型(Wrapper Types)是为了解决基本类型的实例化问题,以便让一个基本类型也能参与到面向对象的编程世界中.而在Java5中泛型更是对基本类型说了"不",如果把一个整型放入List中,就必须使用Integer包装类型.我们看一段代码: import java.util.ArrayList; import java.util.List; public class Client26 { public static int
Life Forms Time Limit: 5000MS Memory Limit: 65536K Total Submissions: 13063 Accepted: 3670 Description You may have wondered why most extraterrestrial life forms resemble humans, differing by superficial traits such as height, colour, wrinkles, e