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IKM在线测试 JAVA 88题带参考答案

java

Concurrent

JDBC

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最新最全的IKM在线测试题库，增加如下内容： spring ioc hibernate multiple questions Concurrency/Threadpool Exceptions HQL Query interface, Criteria in Hibernate SimpleDateFormat

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Updates from ADMjava04 batch:

spring ioc

hibernate multiple questions

Concurrency/Threadpool

Exceptions

More questions on hql

Query interface, Criteria in Hibernate

SimpleDateFormat

1) Which of the following techniques can a Java SE programmer use to increase the thread

safety of a program?

a. Use public static variables

b. Write classes so they are immutable

c. Use ThreadLocal variables

d. Use Final classes

e. Annotate a class with @Multithread

Ans: b,C

2) Under which of the following conditions will an alert message be displayed for the Java

script code given below

<label for=äge”> Please enter your birthday</label>

<input type =”text” name=äge” id=äge” onblur=”validate(this.value)”

functionvalidate(val)

{

if (isNaN(val)

{

alert(“XXX XXX XXX”);

document.frm.age.focus();

}

</script>

a. If the text box age contains a numerical value and the submit button Submit is

clicked

b. If textbox age loses focus and contains a non-numerical value

c. If textbox age contains a non-numerical value and gains focus

d. If textbox age contains a non-numerical value and the submit button Enter is clicked

e. If textbox age loses focus and contains a numerical value

Ans: B

3) A Java EE servlet uses the line of code below:

String targetEmailForRequest = getServletConfig().getInitParameter(“corporateEmail”);

From which of the following locations will the application read the corporateEmail

value?

a. An attribute corporateEmailasteriin the request

b. A <servlet-mapping> element in web.xml

c. A corporateEmail entity in properties.xml

d. An <init-param> element in web.xml

e. A corporateEmail item in the session

Ans: d

4) Which of the following statements correctly describe lightweight and heavyweight Java

Swing components?

a. Lightweight components are faster in response and performance

b. JWindow, JFrame , JDialog and JApplet are lightweight components

c. Heavyweight components provide a consistent look and feel on all platforms

d. Heavyweight components depend on native code counterparts to handle their

functionality

e. AWT components are heavyweight, whereas Swing components are lightweight

Ans: a,d,e

5) Which of the following can be returned in the variable result from invoking the below

Java SE code

java.util.Random r = new java.util.Random();

int result = r.nextInt(7);

a. 3

b. -1

c. 1234567

d. 7

e. 0

Ans: a,e

6) Which of the following statements regarding the usage of the Java SE this() and super()

keywords are valid?

a. If used, this() or super() calls must always be the first statements in a constructor

b. this() and super() can be used in the same (non-constructor) method

c. If neither this() nor super() is coded then the compiler will generate a call to the zero

argument superclass constructor

d. this() and super() calls can be used in methods other than a constructor

e. this() and super() can be used in the same constructor

--------------------------

Ans: a,c

7) Which of the following statements are true about variable access between a Java SE

inner class and its containing class?

a. The inner class cannot access public variables in the containing class

b. The inner class cannot access its own private variables

c. The inner class can access private variables in the containing class

d. The containing class cannot access public variables in the inner class

e. The containing class can access private variables in the inner class

Ans: C,d

8) In Java EE environment, which of the following statements are valid concerning the

choice of a JDBC driver to access a database?

a. Type 2 drivers have been deprecated since J2SE 5.0 and so should not be chosen

b. Type 4 drivers exist for MySQL, Oracle, SQL Server and DB2

c. A type1 driver will perform slightly faster than type2 driver

d. A type3 driver does not support calls to stored procedures

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jimson

2022-01-13

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