標籤:install maven 打包 keep shrinking 執行Maven Install打包的時候,出現以下錯誤資訊:[proguard] java.io.IOException: You have to specify ‘-keep‘ options for the shrinking step.
標籤:install maven 資訊 jar 打包 執行Maven Install打包的時候,出現以下錯誤資訊: [proguard] java.io.IOException: The output jar is empty. Did you specify the proper ‘-keep‘ options?
標籤:Java Class Design Implement encapsulationImplement inheritance including visibility modifiers and compositionImplement polymorphismOverride hashCode, equals, and toString methods from Object classCreate and use singleton classes and
標籤:代碼public class Test { public static void main(String[] args) { new Circle(); }} class Draw { public Draw(String type) { System.out.println(type+" draw constructor"); }} class Shape { private Draw draw = new Draw(
標籤:我們知道Java語言中沒有指標,取而代之的是引用reference。Java中的引用又可以分為四種:強引用,弱引用(WeakReference),軟引用(SoftReference),虛引用(PhantomReference)。其中強引用,就是我們平時使用的最多的最普通的引用,虛引用一般我們是沒有機會使用到的。所以我們主要瞭解下 WeakReference 和 SoftReference。1. 先上一段代碼:public class ReferenceTest { public
標籤:題目:Given a collection of numbers, return all possible permutations.For example,[1,2,3] have the following permutations:[1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2],