Jul 18

Generics in Java #Java Short Notes

  • Generics can prevent many run time errors.
  • A generic class: 
    public class Box {    private T t; // T stands for "Type"              public void add(T t) {        this.t = t;    }    public T get() {        return t;    }}Object creation:
    Box integerBox = new Box();
  • Generic method syntax: public void inspect(U u){}
  • Type Erasure:Check this code: 
    public class MyClass {    public static void myMethod(Object item) {        if (item instanceof E) {  //Compiler error            ...        }        E item2 = new E();   //Compiler error        E[] iArray = new E[10]; //Compiler error        E obj = (E)new Object(); //Unchecked cast warning    }}

From: http://sitestree.com/?p=4902
Categories:Java Short Notes
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Post Data:2007-10-28 07:08:01

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