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102 lines (87 loc) · 2.92 KB
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package stream;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
/**
* Samples for Stream API in Java.
*
* @author kshitijbaluni
* @since 27 June 2022
*/
public class CoreJavaStream {
/**
* map - Sample code to test map intermediate operations.
*
* @param list
* @return result List
*/
private List mapStreamIntermediateOperations(List<Integer> list) {
return list.stream().map(x -> x * x).collect(Collectors.toList());
}
/**
* filter - intermediate operations stream based on the predicate(functional interface/filter condition).
*
* @param list
* @return result List
*/
private List filterStreamIntermediateOperations(List<Integer> list) {
return list.stream().filter(x -> (x % 2 == 0)).collect(Collectors.toList());
}
/**
* sorted - The sorted method is used to sort the stream.
*
* @param list
* @return result List
*/
private List sortedStreamIntermediateOperations(List<Integer> list) {
return list.stream().sorted().collect(Collectors.toList());
}
/**
* collect - The collect method is used to return the result of the intermediate operations performed on the stream.
*
* @param list
* @return result List
*/
private List collectStreamTerminateOperation(List<Integer> list) {
return list.parallelStream().map(x-> x*2).collect(Collectors.toList());
}
/**
* forEach - The forEach method is used to iterate through every element of the stream.
* @param list
*/
private void forEachStreamTerminateOperation(List<Integer> list) {
list.stream().forEach(x -> System.out.print(String.format(" %s",x)));
}
/**
* reduce -The reduce method is used to reduce the elements of a stream to a single value.
* The reduce method takes a BinaryOperator as a parameter.
*
* @param list
* @return
*/
private int reduceStreamTerminateOperation(List<Integer> list) {
return list.stream().limit(3).reduce(0, (ans, i) -> ans + i);
}
/**
* Driver Code
*
* @param args
*/
public static void main(String[] args) {
CoreJavaStream coreJavaStream = new CoreJavaStream();
List<Integer> list = Arrays.asList(2, 4, 3, 5, 3, 4, 2);
List result = null;
result = coreJavaStream.mapStreamIntermediateOperations(list);
System.out.println("\nMap IO stream: " + result);
result = coreJavaStream.filterStreamIntermediateOperations(list);
System.out.println("\nFilter IO stream: " + result);
result = coreJavaStream.sortedStreamIntermediateOperations(list);
System.out.println("\nSorted IO stream: " + result);
result = coreJavaStream.collectStreamTerminateOperation(list);
System.out.println("\nCollect TO stream: " + result);
System.out.print("\nForEach TO stream: ");
coreJavaStream.forEachStreamTerminateOperation(list);
int output = coreJavaStream.reduceStreamTerminateOperation(list);
System.out.println("\n\nReduce TO stream: " + output);
}
}