null
finally
null finally
Compilation fails.
finally exception
第1题:
下面程序的输出结果为( )。 public class Test { public static void main (String args[]) { String X="ABCD"; String Y="EFG"; X=X.substring (X.length()-Y.length()); System.out.println(X); } }
A.ABC
B.BCD
C.EFG
D.ABCDEFG
第2题:
现有一个文件file21.txt,其内容是: abCdEf, 执行下列程序之后,输出的结果是______。 package ch1; import java,io.*; public class ex21 { static String name = "ch1\\file21.txt"; public static void main(String[] args) { try { readFile (); } catch(IOException ioe) { System.out.println(ioe.getMessage()); } } static void readFile () throws IOException { BufferedReader br = null; try { File f = new File(name); FileReader fr = new FileReader(f); br = new BufferedReader(fr); String str= br.readLine(); System.out.println(str.toLowerCase()); } finally if(br != null) br.close (); } } }
A.AbCdEf
B.abcdef
C.aBcDeF
D.ABCDEF
第3题:
What happens when you try to compile and run the following program?
class Mystery{String s;public static void main(String[] args){
Mystery m=new Mystery();m.go();}void Mystery(){s=”constructor”;}void go(){System.out.println(s);}
}()
A.this code will not compile
B.this code compliles but throws an exception at runtime
C.this code runs and “constructor” in the standard output
D.this code runs and writes “null” in the standard output
第4题:
A. 7
B. 6
C. 5
D. 8
第5题:
下列程序的运行结果是( )。 public class test{ private String[]data={¨10","10.5"); public void fun{ double s=0: for(int i=0;i<3;j++){ try{ s=s+Integer.parseInt(data[i]); catch(Exception e){ System.out.print("errorl:"+data[i]); } } } public static void main(string[]args){ try{ test d=new test: fun: }catch(Exception e){ System.OUt.println("error2") } } }
A.errorl:10.5
B.error2
C.errorl:10.5 error2
D.以上都不对
第6题:
staticvoidtest(){try{Stringx=null;System.out.print(x.toString()+);}finally{System.out.print(finally);}}publicstaticvoidmain(String[]args){try{test();}catch(Exceptionex){System.out.print(”exception);}}Whatistheresult?()
A.null
B.finally
C.nullfinally
D.Compilationfails.
E.finallyexception
第7题:
执行下面程序,显示的结果为( )。 public class Test { public static void main (String args[]) { Test t=newTest(); System.out.println (Loverload ("2","3")); } int overload (intx,int y) {return x+y;} String overload (String x,Stnng y){return x+y;} }
A.2
B.3
C.5
D.23
第8题:
下列程序段运行的结果为 public class Test{ static void print(String s,int i){ System.out.println("String:"+s+",int:"+i); } static void print(int i,String s){ System.out.println("int:"+i+",String:"+s); } public static void main(String[]args){ print(99,"Int first"); } }
A.String:String first,int:11
B.int:11,String:Int first
C.String:String first,int99
D.int:99,String:Int first
第9题:
A.跳出循环,无输出
B.0121
C.01
D.0123
第10题:
A. hello
B. hello2
C. 编译报错
D. 运行报错,不能将串与整数相加