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JAVA에서 Stream의 GroupingBy 사용하는 몇가지 예제이다. GroupingBy 예제를 위한 Fruit Class public class Fruit { private final int id; private final String name; private final int quantity; private final BigDecimal price; public Fruit(final int id, final String name, final int quantity, final BigDecimal price) { this.id = id; this.name = name; this.quantity = quantity; this.price = price; } public int getId() { retu..

JAVA 8 기본 GC > Parallel GC Lambda Expression Repeating Annotation import java.lang.annotation.Repeatable; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; @Repeatable(Colors.class) @interface Color { String name(); } @Retention(RetentionPolicy.RUNTIME) @interface Colors { Color[] value(); } @Color(name = "red") @Color(name = "blue") @Color(name = "green") class..