Never Too Late

摘要： 成员变量有默认值，而局部变量是没有默认值的 package com.demo20; public class InitError { int x=10; int y; void f() { int m; x=y+m;////报错：The local variable m may not have b 阅读全文

摘要： 含浮点数的计算 package com.demo19; public class Lader { float above; float bottom; float height; float area; float computerArea() { area=(above+bottom)*heigh 阅读全文