While loop with double value : While Loop « Statement Control « Java Tutorial

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2. Statement Control
3. While Loop

public class MainClass {
  public static void main(String[] args) {
    double r = 0;
    while(r < 0.99d) {
      r = Math.random();
      System.out.println(r);
    }
  }
}

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0.15254413511361042
0.6688621030424611
0.143156733550304
0.3867695752401421
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0.8262243996358971
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0.6390549075075913
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0.6340862529502882
0.3240420706550172
0.07246065490188025
0.35761285323105796
0.9964556875646731