如何在 Java 中将一个字符串转换为一个 int 类型？

Question

How can I convert a String to an int in Java?

My String contains only numbers, and I want to return the number it represents.

For example, given the string "1234" the result should be the number 1234.

转载于:https://stackoverflow.com/questions/5585779/how-do-i-convert-a-string-to-an-int-in-java

Answer 1

For example, here are two ways:

Integer x = Integer.valueOf(str);
// or
int y = Integer.parseInt(str);

There is a slight difference between these methods:

• valueOf returns a new or cached instance of java.lang.Integer
• parseInt returns primitive int.

The same is for all cases: Short.valueOf/parseShort, Long.valueOf/parseLong, etc.