JDK8源碼

/**

* Returns an {@code Integer} object holding the value

* extracted from the specified {@code String} when parsed

* with the radix given by the second argument. The first argument

* is interpreted as representing a signed integer in the radix

* specified by the second argument, exactly as if the arguments

* were given to the {@link #parseInt(java.lang.String, int)}

* method. The result is an {@code Integer} object that

* represents the integer value specified by the string.

*

*

In other words, this method returns an {@code Integer}

* object equal to the value of:

*

*

* {@code new Integer(Integer.parseInt(s, radix))}

*

*

* @param s the string to be parsed.

* @param radix the radix to be used in interpreting {@code s}

* @return an {@code Integer} object holding the value

* represented by the string argument in the specified

* radix.

* @exception NumberFormatException if the {@code String}

* does not contain a parsable {@code int}.

*/

public static Integer valueOf(String s, int radix) throws NumberFormatException {

return Integer.valueOf(parseInt(s,radix));

}

這里用Inteager來說明， valueOf 實際上調用了 parseInt。

parseInt方法是類Integer的靜態方法，它的作用就是將字符串轉化為整數int

valueOf也是Integer類的靜態方法，它的作用是將字符串轉化為Integer對象

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