java 实现将Object类型转换为int类型

Object object = null;
try
{
    Integer.parseInt(object.toString());
}
catch (NumberFormatException e)
{}

//可以先判定一下是否是Integer
Object object = "111";
if (object instanceof Integer) {
   Integer.parseInt(object.toString());
}

String a = "15";
System.out.println(Integer.valueOf(a) == Integer.valueOf("15"));

String a = "423";
System.out.println(Integer.valueOf(a) == Integer.valueOf("423"));

public static Integer valueOf(int i) {     
      final int offset = 128;     
      if (i >= -128 && i <= 127) { // must cache      
        return IntegerCache.cache[i + offset];     
     }     
     return new Integer(i);     
}