多项选择题
A.public void addStrings(List list) {
B.public void addStrings(List<String> list) {
C.public void addStrings(List<? super String> list) {
D.public void addStrings(List<? extends String> list) { B,C
多项选择题 Given： A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）
单项选择题 Given： What is the appropriate definition of the hashCode method in class Person？（）
单项选择题 Click the Exhibit button. Which statement is true about the set variable on line 12？（）
