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Merge pull request #2511 from Kisa-Dong/main

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Update java-basic-questions-01.md
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@ -665,7 +665,7 @@ private static long sum() {
```java
float a = 2.0f - 1.9f;
float b = 1.8f - 1.7f;
System.out.println(a);// 0.100000024
System.out.printf("%.9f",a);// 0.100000024
System.out.println(b);// 0.099999905
System.out.println(a == b);// false
```