Type conversion problems caused by Java generic type erasure

Preliminary conclusion: Generic type conversion is not reliable;

Source:

 Package Com.srie.testjava;  Public class Testclassdefine4<t> {    publicstaticvoid  main (string[] args) {        TestClassDefine4 New Testclassdefine4<string>();         = T4.badcast (1);        System.out.println (cast);    }    T Badcast (Integer i) {        return//  here is warning    }}

Anti-compilation:

 Package Com.srie.testjava; Import Java.io.PrintStream;  Public class Testclassdefine4<t>{  publicstaticvoid  main (string[] args)  {    new  TestClassDefine4 ();     = (String) t4.badcast (integer.valueof (1));    System.out.println (cast);  }  T Badcast (Integer i) {    return  i;  }}

Run Exception:

Exception in thread "main" Java.lang.ClassCastException:java.lang.Integer cannot is cast to java.lang.String    at Com.srie.testjava.TestClassDefine4.main (Testclassdefine4.java:7)

Type conversion problems caused by Java generic type erasure