Yeong Jin

double value = 1/ 2.0; double value = 1/ (double) 2; 더블로 받아야한다. 둘중 하나이상이 실수형이거나 double로 캐스팅되어있어야한다.

배열에서 가장 긴/짧은 글자를 뽑을 때 사용 import java.util.Arrays; import java.util.function.BinaryOperator; class Compare implements BinaryOperator{ @Override public String apply(String s1, String s2) { if(s1.getBytes().length < s2.getBytes().length) return s1; else return s2; } } public class Reduce { public static void main(String[] args) { String[] arr = {"안녕하세요~~~~","hello","안냐세요"}; System.out.println( Arra..

import java.util.ArrayList; import java.util.List; import java.util.stream.Stream; public class Stream2 { public static void main(String[] args) { List arr = new ArrayList(); arr.add("lee"); arr.add("kim"); arr.add("park"); Stream st = arr.stream(); st.forEach(s->System.out.println(s)); arr.stream().sorted().forEach(s->System.out.println(s)); } }

package Chapter13_Lambda; interface PrintString{ void showString(String str); } public class Lambda2 { public static void main(String[] args) { PrintString ps1 = str->System.out.println(str); ps1.showString("hello"); showStringMethod(ps1); PrintString ps2 = Method(); ps2.showString("haha"); } public static PrintString Method() { return str->System.out.println(str); }; private static void showStr..