查找某字符串是否以s为结尾
查找某字符串是否与s完全匹配
确定某字符串与s的大小关系
确定某字符串是否以s为开始
第1题:
A.Strings=c.readLine();
B.char[]c=c.readLine();
C.Strings=c.readConsole();
D.char[]c=c.readConsole();
E.Strings=c.readLine("%s","name");
F.char[]c=c.readLine("%s","name");
第2题:
importjava.util.*;publicclassWrappedString{privateStrings;publicWrappedString(Strings){this.s=s;}publicstaticvoidmain(String[]args){HashSeths=newHashSet();WrappedStringws1=newWrappedString(”aardvark”);WrappedStringws2=newWrappedString(”aardvark”);Strings1=newString(”aardvark”);Strings2=newString(”aardvark”);hs.add(ws1);hs.add(ws2);hs.add(s1);hs.add(s2);System.out.println(hs.size());}}Whatistheresult?()
A.0
B.1
C.2
D.3
E.4
F.Compilationfails.
G.Anexceptionisthrownatruntime.
第3题:
A.Strings="Gonewiththewind";Stringt="good";Stringk=s+t;
B.Strings="Gonewiththewind";Stringt;t=s[3]+"one";
C.Strings="Gonewiththewind";Stringstandard=s.toUpperCase();
D.Strings="homedirectory";Stringt=s-"directory";
第4题:
对于下面( )类定义,可以通过“newJ_Class()”生成类J_Class的实例对象。
A、publicclassJ_Class{
publicJ_Class(void){}
}
B、publicclassJ_Class{}
C、publicclassJ_Class{
publicJ_Class(Strings){}
}
D、publicclassJ_Class{
publicvoidJ_Class(){}
publicJ_Class(Strings){}
第5题:
Why we use StringBuffer when concatenating strings?
第6题:
importjava.util.*;publicclassLetterASort{publicstaticvoidmain(String[]args){ArrayListstrings=newArrayList();strings.add(?aAaA”);strings.add(”AaA”);strings.add(?aAa”);strings.add(”AAaa”);Collections.sort(strings);for(Strings:strings){System.out.print(s+);}}}Whatistheresult?()
A.Compilationfails.
B.aAaAaAaAAaaAaA
C.AAaaAaAaAaaAaA
D.AaAAAaaaAaAaAa
E.aAaAaAaAaAAAaa
F.Anexceptionisthrownatruntime.
第7题:
A.Theprogramrunsandprints“Hello”
B.Anerrorcausescompilationtofail.
C.Theprogramrunsandprints“Helloworld!”
D.Theprogramrunsbutabortswithanexception.
第8题:
A.Strings="john"+"was"+"here";
B.Strings="john"+3;
C.inta=3+5;
D.inta=5+5.5;
第9题:
阅读下面程序 publicclass Operators AndExpressions{ voidequalsMethodl(){ Strings1=newString("howareyou"); Strings2=newString("howareyou"); System.out.println(s1==s2); } publicstaticvoidmain(Stringargs[]){ OperatorsAndExpressionsOperAndExp=newOperatorsAndExpressions (); //用于复合类型数据的“==”运算符 OperAndExp.equalsMethodl(); } } 程序运行结果是( )。
A.==
B.true
C.false
D.equal
第10题:
下面这段代码会产生( )个String对象。
Strings1="hello";
Strings2=s1.substring(2,3);
Strings3=s1.toString();
Strings4=newStringBuffer(s1).toString();
A、1
B、2
C、3
D、4