在java.lang包中定义了Integer类作为int数据类型的对等类，其中定义了如下方法：

public static Integer valueOf(String s) throws NumberFormatException

用于将字符串s转换成Integer对象。当s不符合整数格式时，该方法抛出NumberFormatException异常。请编写简单程序转换一字符串为Integer对象，用2种方法抛出NumberFormatException异常：一种由程序本身捕获并处理异常，另一种将异常抛出，交由JVM捕获处理。

-Defined in the java.lang package classes as the int data type Integer peer class, which defines the following method: public static Integer valueOf (String s) throws NumberFormatException is used to convert the string s Integer object. When s does not meet the integer format, this method throws NumberFormatException exception. Please write a simple program to convert a string to an Integer object, using two kinds of method throws NumberFormatException exception: one by the program itself to catch and handle exceptions, and the other will be an exception thrown by JVM capture process.