【正文】
act method must be embraced by using “{ }” C. “{ }” may be used or not when declaring abstract method D. “{ }” can NOT be used when declaring abstract method 7. Which statement is INCORRECT A. List will save the elements in specific order. B. There may be duplicate elements within List. C. There may be duplicate elements within Set. D. Map will save keyvalue pair. 8. If run the following JAVA application, the output should be: public class Test1 { public static void changeStr(String str){ str=”wele”。 a=a。c=0。 ( (s+bye).intern()==Go+odbye )。 } } A. It can not be piled correctly B. It will print nothing C. It will print “miaow” D. It will print “miaow miaow ” 4. Please figure out the correct output of the following JAVA program public static void main(String[] a){ String s = Good。 ()。 } } class DummyCat extends Cat { public void cry() { } } public class CatCry { public static void main(String args[]) { Cat mimi = new Cat()。1. Which of the following statements about JAVA language is correct? A. Constructor within class can not be ignored B. Constructor must have the same name with class, bu