多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInput

题目

多选题

Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）

When using versions of Java technology earlier than 5.0.

When sharing a StringBuffer among multiple threads.

When using the java.io class StringBufferInputStream.

When you plan to reuse the StringBuffer to build more than one string.

更多“多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInput”相关问题

第1题

public class Team extends java.util.LinkedList { public void addPlayer（Player p） { add（p）； } public void compete（Team opponent） { /* more code here */ } } class Player { /* more code here */ } Which two are true？（）A、 This code will compile.B、 This code demonstrates proper design of an is-a relationship.C、 This code demonstrates proper design of a has-a relationship.D、 A Java programmer using the Team class could remove Player objects from a Team object.

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第2题

Which methods from the String and StringBuffer classes modify the object on which they are called？（） A、The charAt（） method of the String class.B、The toUpperCase（） method of the String class.C、The replace（） method of the String class.D、The reverse（） method of the StringBuffer class.E、The length（） method of the StringBuffer class.

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第3题

Public class test （ Public static void stringReplace （String text）（ Text = text.replace （‘j’ ， ‘i’）；） public static void bufferReplace （StringBuffer text）（ text = text.append （“C”）） public static void main （String args[]} （ String textString = new String （“java”）； StringBuffer text BufferString = new StringBuffer （“java”）； stringReplace （textString）； bufferReplace （textBuffer）； System.out.printLn （textString + textBuffer）；）） What is the output？（）

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第4题

A developer chooses to avoid using SingleThreadModel but wants to ensure that data is updated in athread-safe manner. Which two can support this design goal？（）A、Store the data in a local variable.B、Store the data in an instance variable.C、Store the data in the HttpSession object.D、Store the data in the ServletContext object.E、Store the data in the ServletRequest object.

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第5题

public class MyLogger { private StringBuilder logger = new StringBuuilder（）； public void log（String message， String user） { logger.append（message）； logger.append（user）； } } The programmer must guarantee that a single MyLogger object works properly for a multi-threaded system. How must this code be changed to be thread-safe？（） A、 synchronize the log methodB、 replace StringBuilder with StringBufferC、 No change is necessary， the current MyLogger code is already thread-safe.D、 replace StringBuilder with just a String object and use the string concatenation （+=） within the log method

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第6题

A Company.com developer chooses to avoid using SingleThreadModel but wants to ensure that data is updated in a thread-safe manner. Which two can support this design goal？（）A、 Store the data in a local variable.B、 Store the data in an instance variable.C、 Store the data in the HttpSession object.D、 Store the data in the ServletContext object.E、 Store the data in the ServletRequest object.

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第7题

Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object？（）A、When using versions of Java technology earlier than 5.0.B、When sharing a StringBuffer among multiple threads.C、When using the java.io class StringBufferInputStream.D、When you plan to reuse the StringBuffer to build more than one string.

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多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInput

题目

更多“多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInput”相关问题

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