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It is often necessary to handle data in our programs, and it is not in the format that we want. With Java, you can do conversions of objects, such as a string to int, and vice-versa. In this article, we will show you several conversions methods in Java.

Converting String to integer

Make the conversion of a String to an integer using the parseInt() method of Integer class, or by using the methods valueOf() and intValue() of the Integer class combined, as shown in the following code.

str = "25";
int i = Integer.valueOf (str).intValue();
//or
int i = Integer.parseInt(str);

Converting a String to a float

Convert a String to float through the combination of the methods valueOf () and floatValue () of Float class.

float f = Float.valueOf(str).floatValue();

Converting a String to a long

You can make the conversion of a String to long using the parseLong() method of Long class, or using the combination of the methods valueOf() and longValue(), also from Long class.

long l = Long.valueOf(str).longValue();
//or
long l = Long.parseLong(str);

Similarly, going in the other direction, we can:

Converting an integer to a String

See in the code below two ways to do the conversion of an integer to a string:

int i = 42;
String str = Integer.toString(i);
//or
String str = "" + i;

Converting a long to a String

You can do the conversion from long to String using the toString method of the class.

long l = 42;
String str = Long.toString(l);

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