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