四、下面 JAVA 程式輸出是什麼？（24 分） public class C1 { public static void main(String[ ] args) { String s4 = new String("restful"), s5 = new String("restful"), s6 = new String("peaceful"), s7 = s4, s8 = "restful", s9 = "restful"; System.out.println(s4.equals(s5)); System.out.println(s4.equals(s6)); System.out.println(s4 == s5); System.out.println(s4 == s7); System.out.println(s4 == s8); System.out.println(s8 == s9); } }