A: ngjianfeng
B: hgjianfeng
C: hngjianfeng
D: hjianfeng
举一反三
- class Test { public static void main(String[] args) { StringBuffer sb = new StringBuffer("abcd"); sb.reverse(); System.out.println( sb.toString() ); } } 代码的输出结果是： dcba
- 分析下面的Java程序段,编译运行后的输出结果是( )。public class Test {public void changeString(StringBuffer sb) {sb.append("stringbuffer2");}public static void main(String[] args) {Test a = new Test();StringBuffer sb = new StringBuffer("stringbuffer1");a.changeString(sb);System.out.println("sb = " + sb);}} A: sb = stringbuffer2stringbuffer1 B: sb = stringbuffer1 C: sb = stringbuffer2 D: sb = stringbuffer1stringbuffer2
- public class StringBufferTest {public static void main(String[] args) {StringBuffer sb=new StringBuffer("aynu,aynu");sb.deleteCharAt(4);System.out.println(sb);//第1空sb.delete(4, 8);System.out.println(sb);//第2空}}
- class Test { public static void main(String[] args) { StringBuffer sb = new StringBuffer("hello world"); sb.delete(6,sb.length()); System.out.println( sb.toString() ); } } A: Hello w B: Hello C: Hello worl
- StringBuffer sb = new StringBuffer("aynu");sb.insert(1, true);System.out.println(sb); A: trueaynu B: atrueynu C: aynutrue D: 运行不通过
内容
- 0
public class Example { String str = new String("Java"); StringBuffer sb = new StringBuffer("C#"); public void strcat(String str, StringBuffer sb) { str = str + " study"; sb = sb.append(" exam"); } public static void main(String args[]) { Example ex = new Example(); ex.strcat(ex.str, ex.sb); System.out.println(ex.str); System.out.println(ex.sb); }}程序的输出结果是：______
- 1
class Test { public static void main(String[] args) { StringBuffer sb = new StringBuffer("jack"); sb.append(true); sb.append('a'); sb.append(97).append(34.0).append(new char[]{'A','B'}); // 链式编程 System.out.println( sb.toString() ); // 输出缓冲区的中文本数据 sb = new StringBuffer("jack"); sb.insert( 2, "java" ); System.out.println( sb.toString() ); } } A: jacktruea9734.0AB jjavaack B: jacktruea9734.0AB jajavack C: jacktrueaa34.0AB jajavack D: jacktruea9734AB jajavack
- 2
5、下列程序的运行结果是（）。public static void main( String[] args ){StringBuffer sb = new StringBuffer();sb.append("qq").append("ww");show( sb, "ss" );System.out.println( sb.length() );}public void show( StringBuffer sb, String str ){sb.append( str );} A: 4 B: 2 C: 6 D: 0
- 3
下列程序对字符串进行操作public class Test{public static void main(String[ ] args){StringBuffer sb = new StringBuffer("保护环境");______1______("责任");//追加字符串System.out.println(sb); ______2______(4,"大家的");//插入字符串System.out.println(sb);______3______(4,7);//删除字符串System.out.println(sb);}}
- 4
中国大学MOOC: 运行如下程序，输出结果是（）。StringBuffer sb = new StringBuffer(good morning!);String sub = sb.substring(0, 8);System.out.println(sub);System.out.print(/);char c = sb.charAt(6);System.out.println(c);