[单选题]

阅读下面程序 public class ExampleStringBuffer { public static void main(String[] args) { StringBuffer sb=new StringBuffer("test"); System.out.println("buffer="+sb); System.out.println("length="+sb.length()); } } 程序运行结果中,在“length=”后输出的值是

A.10

B.4

C.20

D.30

参考答案与解析:

相关试题

请阅读下面程序public class ExampleStringBuffer{

[单选题]请阅读下面程序 public class ExampleStringBuffer{ public static void main(String []args){ StringBuffer sb=new StringBuffer("test"); System.out.println("buffer="+sB) ; System.out.println("length="+sb.length());} } 程序运行结果中在"length="后输出的值A.10B.4C.20D.30

  • 查看答案
  • 请阅读下面程序public class ExampleStringBuffer{

    [单选题]请阅读下面程序 public class ExampleStringBuffer{ public static void main(String []args){ StringBuffer sb=new StringBuffer("test"); System.out.println("buffer="+sB) ; System.out.println("length="+sb.length());} } 程序运行结果中在"length="后输出的值A.10B.4C.20D.30

  • 查看答案
  • 阅读下面程序public class VariableUse { public

    [单选题]阅读下面程序 public class VariableUse { public static void main(String[] arqs) { int a; if(a==8) { int b=9; System.out.println("a="+a); System.out.println("b="+b); } System.out.println("a="+a); System.out.println("b="+b): } } 该程序在编译时的结果是A.变量a未赋值B.第

  • 查看答案
  • 阅读下面程序:public class ThreadTest { public

    [单选题]阅读下面程序: public class ThreadTest { public static void main(String args[]) throws Exception { int i=0; Hello t=new Hello(); ______; While(true) } System.out.println("Good Morning"+i++); if(i==2&&t.isAlive()) { System.out.println("Main waitin

  • 查看答案
  • 阅读下面程序public class Increment { public st

    [单选题]阅读下面程序 public class Increment { public static void main( String args[] ){ int c; c=5; System.out.println(C) ; System.out.println(c++); System.out.println(C) ; } }A.5 6 6B.5 5 6C.6 7 7D.6 6 6

  • 查看答案
  • 阅读下面程序public class Increment {public sta

    [单选题]阅读下面程序 public class Increment { public static void main( String args[] ){ int c; c=5; System.out.println( c ); System.out.println( c++ ); System.out.println( c ); } )程序运行结果是( )。A.5 6 6B.5 5 6C.6 7 7D.6 6 6

  • 查看答案
  • 阅读下面程序 public class ConcatTest{public st

    [单选题]阅读下面程序 public class ConcatTest{ public static void main(String[] args) { String strl = "abc"; String str2 = "ABC"; String str3 = str1.concat(str2); System.out.println(str3); } } 程序的运行结果是:A.abeB.ABCC.abcABCD.ABCabc

  • 查看答案
  • 阅读下面程序public class Increment { public st

    [单选题]阅读下面程序 public class Increment { public static void main( String args[] ){ int c; c=5; System.out.println(C) ; System.out.println(c++); System.out.println(C) ; } }A.5 6 6B.5 5 6C.6 7 7D.6 6 6

  • 查看答案
  • 请阅读下面程序 public class ThreadTest {public

    [单选题]请阅读下面程序 public class ThreadTest { public static void main(String args[]) throws Exception{ int i=0; Hello t=new Hello(); while(true) { System.out.println("Good Moming"+i++); if (i==2 && t.isAlive()) { System. out.println("Main waiting for

  • 查看答案
  • 请阅读下面程序 public class ThreadTest {public

    [单选题]请阅读下面程序 public class ThreadTest { public static void main(String args[]) throws Exception{ int i=0; Hello t=new Hello(); while(true) { System.out.println("Good Moming"+i++); if (i==2 && t.isAlive()) { System. out.println("Main waiting for

  • 查看答案
  • 阅读下面程序public class ExampleStringBuffer {