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问答题
String/StringBuilder的异同
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Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?()
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public class TestString3 { public static void main(String[] args) { // insert code here System.out.println(s); } } Which two code fragments, inserted independently at line 3, generate the output 4247?()A、 String s = “123456789”; s = (s-”123”).replace(1,3,”24”) - “89”;B、 StringBuffer s = new StringBuffer(”123456789”); s.delete(0,3).replace( 1,3, “24”).delete(4,6);C、 StringBuffer s = new StringBuffer(”123456789”); s.substring(3,6).delete( 1 ,3).insert(1, “24”);D、 StringBuilder s = new StringBuilder(”123456789”); s.substring(3,6).delete( 1 ,2).insert( 1, “24”);E、 StringBuilder s = new StringBuilder(”123456789”); s.delete(0,3).delete( 1 ,3).delete(2,5).insert( 1, “24”);
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关于 String、StringBuffer 和 StringBuilder 说法错误的是()A、String 创建的字符串是不可变的B、StringBuffer 创建的字符串是可变的,而所引用的地址一直不变C、StringBuffer 是线程安全的,因此性能比 StringBuilder 好D、StringBuilder 没有实现线程安全,因此性能比 StringBuffer 好
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Given this method in a class: public String toString() { StringBuffer buffer = new StringBuffer(); buffer.append(‟‟); buffer.append(this.name); buffer.append(‟‟); return buffer.toString(); } Which is true?() A、 This code is NOT thread-safe.B、 The programmer can replace StringBuffer with StringBuilder with no other changes.C、 This code will perform well and converting the code to use StringBuilder will not enhance the performance.D、 This code will perform poorly. For better performance, the code should be rewritten: return ““+ this.name + “”;
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单选题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
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单选题关于String,StringBuilder以及StringBuffer,描述错误的是()。A
对String对象的任何改变都不影响到原对象,相关的任何change操作都会生成新的对象B
StringBuffer是线程安全C
StringBuilder是线程安全D
可以修改StringBuilder和StringBuffer的内容
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String在进行运算时会产生一个新的实例,而StringBuilder则不会B
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单选题Given this method in a class: public String toString() { StringBuffer buffer = new StringBuffer(); buffer.append(‟‟); return buffer.toString(); } Which is true?()A
This code is NOT thread-safe.B
The programmer can replace StringBuffer with StringBuilder with no other changes.C
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单选题关于 String、StringBuffer 和 StringBuilder 说法错误的是()A
String 创建的字符串是不可变的B
StringBuffer 创建的字符串是可变的,而所引用的地址一直不变C
StringBuffer 是线程安全的,因此性能比 StringBuilder 好D
StringBuilder 没有实现线程安全,因此性能比 StringBuffer 好
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问答题System.String和System.StringBuilder有什么区别?
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