阿朗卡特java工程师笔试题.docVIP

Which of the following statements about JAVA language is correct? Constructor within class can not be ignored Constructor must have the same name with class, but method can’t Constructor can only be executed when creating a new object One class can only define one constructor For JAVA language, which one Operator is VALID? @ := Please chose the right statement about the following JAVA program class Cat { public void cry() { System.out.print(miaow ); } } class DummyCat extends Cat { public void cry() { } } public class CatCry { public static void main(String args[]) { Cat mimi = new Cat(); Cat dummy = new DummyCat(); mimi.cry(); dummy.cry(); } } It can not be compiled correctly It will print nothing It will print “miaow” It will print “miaow miaow ” Please figure out the correct output of the following JAVA program public static void main(String[] a){ String s = Good; System.out.print( Good+bye==Go+odbye ); System.out.print( (s+bye).intern()==Go+odbye ); } falsefalse falsetrue truefalse truetrue After executing the following code:　　a=0;c=0;　　do{　　 --c;　　 a=a--;　　} while (a=0);what is c’s value? 0 -1 -2 Dead Loop Which statement is CORRECT? The keyword abstract can be used for field, method and class Body part of abstract method must be embraced by using “{ }” “{ }” may be used or not when declaring abstract method “{ }” can NOT be used when declaring abstract method Which statement is INCORRECT List will save the elements in specific order. There may be duplicate elements within List. There may be duplicate elements within Set. Map will save key-value pair. If run the following JAVA application, the output should be: public class Test1 { ???? public static void changeStr(String str){ ??????? str=”welcome”; } public static void main(String[] args) { ??????? String str=”1234”; ??????? changeStr(str); ??????? System.out.println(str); } } 1234 welcome 1234w