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The All-in-One Guide to Java Programming

Comparison to Java 7

Learn about the difference between Java 7 and Java 8 code.

We'll cover the following...

Java 7 vs. Java 8

To better illustrate the benefit of Streams in Java 8, here are some examples of code from Java 7 compared to their new versions.

Find a maximum

Java
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.stream.IntStream;
import java.util.stream.Stream;
public class Compare {
    public double max(List<Double> list) {
      assert list.size() > 0;
      // Java 7
      double max = 0;
      for (Double d : list) {
          if (d > max) {
              max = d;
          }
      }
      return max;
    }
    public static void main(String[] args) {
      Compare c = new Compare();
      System.out.println(c.max(Arrays.asList(0.1, 0.2, 0.21)));
    }
}

The above code finds the maximum value in a list of numbers. In Java 7, the implementation uses a for loop to iterate through the list and initialize max with the largest ...