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Convert Float to String in Java

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🏄 Float to String Conversion in Java – Ride the Waves of Precision​

Ever tried turning a float into a string in Java? It's like trying to explain a math joke—some get it instantly, others just stare. 😆 No worries, though! We’ve got a few smooth tricks up our sleeve to make this conversion as easy as floating on water. 🌊

1️⃣ Using Float.toString() – The Go-To Surfer 🏄‍♂️​

The Float.toString() method transforms your float into a string effortlessly. Works like a charm for both positive and negative numbers!

float PI = 3.1415927f;
float negativePI = -3.1415927f;

Assertions.assertEquals("3.1415927", Float.toString(PI));
Assertions.assertEquals("-3.1415927", Float.toString(negativePI));

But wait… what if the float is being sneaky? 🤔​

  • If the argument is NaN, the result is the string "NaN". (No worries, no exceptions thrown!)
  • If the float is infinity, it gracefully returns "Infinity".
Assertions.assertEquals("NaN", Float.toString(0.0f / 0.0f));
Assertions.assertEquals("Infinity", Float.toString(Float.POSITIVE_INFINITY));
Assertions.assertEquals("-Infinity", Float.toString(Float.NEGATIVE_INFINITY));

2️⃣ Using String.valueOf() – The Chilled-Out Alternative 🧊​

String.valueOf() is like that cool friend who just repeats what you say. 😎 It internally calls Float.toString(), so the behavior is exactly the same.

float PI = 3.1415927f;
float negativePI = -3.1415927f;

Assertions.assertEquals("3.1415927", String.valueOf(PI));
Assertions.assertEquals("-3.1415927", String.valueOf(negativePI));

3️⃣ Formatting Float to N Decimal Points 🎯​

If you don’t want to scare your friends with too many decimal points, you can format the float using NumberFormat.format(float). This lets you set how many decimals you want.

Example: Formatting to 2 decimal points​

NumberFormat formatter = new DecimalFormat("0.00");
Assertions.assertEquals("3.14", formatter.format(PI));

Boom! Now your float is all dressed up and looking sharp. 🔥

🎉 Wrapping Up​

Today, we rode the waves of float-to-string conversion and learned: ✅ Float.toString() is the recommended way. ✅ String.valueOf() is basically the same thing but looks cooler. ✅ Formatting with NumberFormat makes your float look polished.

So, next time your float needs a wardrobe change, you know what to do! 🕶️ Drop your questions in the comments.

Happy Learning & Keep Coding! 🚀