Convert string number to integer number

2018-06-06 18:23:56

This question already has an answer here:

How do I convert a String to an int in Java? 30 answers

Use Wrapper Class.

Examples are below

int

int a = Integer.parseInt("1"); // Outputs 1

float

float a = Float.parseFloat("1"); // Outputs 1.0

double

double a = Double.parseFloat("1"); // Outputs 1.0

long

long a = Long.parseLong("1"); // Outputs 1

int one = Integer.parseInt("1");

理想情况下，你也应该捕捉错误：

int i;
String s = "might not be a number";
try {
   i = Integer.parseInt(s);
} catch (NumberFormatException e) {
   //do something
}

Integer.parseInt这样做的。

int foo = Integer.parseInt("1");

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