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package scjp; public class PrimiObj { Integer i; int x; public PrimiObj(int y) { x = i + y; System.out.println(x); ; } public static void main(String[] args) { new Pr...

package scjp; import java.util.HashSet; public class WrappedString { private String s; public WrappedString(String s) { this.s = s; } // @Override // public int hashCode() { /...

public class Args1Test { public static void main(String[] args) { try { args = null; args[0] = "test"; } catch (Exception ex) { System.out.println("Exception"); } ca...

JavaBean Listener Naming Rules Listener method names used to "register" a listener with an event source must use the prefix add, followed by the listener type. For example,addActionListener() is a ...

java泛型中的super关键字不太常用，也不太好理解，今天又从头看了看java的泛型机制，作一记录。 上界: 上界用extends关键字声明，表示参数化的类型可能是所指定的类型，或者是此类型的子类。如下面的代码：  Java代码   public void upperBound(List<? extends Date> list, Date date)   { ...