多項選擇題

Given：

Which two code fragments， inserted independently at line 5， will compile without warnings？（）

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

你可能感興趣的試題

多項選擇題

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？（）

A.public int hashCode（）
B.public boolean equals（Key k）
C.public int compareTo（Object o）
D.public boolean equals（Object o）
E.public boolean compareTo（Key k）

單項選擇題

Given：

What is the appropriate definition of the hashCode method in class Person？（）

A.return super.hashCode（）；
B.return name.hashCode（） + age * 7；
C.return name.hashCode（） + comment.hashCode（） / 2；
D.return name.hashCode（） + comment.hashCode（） / 2 - age * 3；

Given： Which two code fragments， inserted independently at line 5， will compile without warnings？（）

你可能感興趣的試題

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？（）

Given： What is the appropriate definition of the hashCode method in class Person？（）

Given：

Which two code fragments， inserted independently at line 5， will compile without warnings？（）

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？（）

Given：

What is the appropriate definition of the hashCode method in class Person？（）