public class Alpha{ public static void main( string[] args ){ if ( args.length == 2 ) { if ( args.[0].equalsIgnoreCase(“-b”) ) System.out.println( new Boolean( args[1] )); } } } And the code is invoked by using the command: java Alpha –b TRUE What is the result?()
第1题:
设有如下程序
public class test {
public static void main(String args[]) {
Integer intObj=Integer.valueOf(args[args.length-1]);
int i = intObj.intValue();
if(args.length >1、
System.out.println(i);
if(args.length >0)
System.out.println(i -1、;
else
System.out.println(i - 2、;
}
}
运行程序,输入如下命令:
java test 2
则输出为:
A. test
B. test -1
C. 0
D. 1
E. 2
第2题:
以下是JAVA中正确的入口方法是? ()
第3题:
Which declarations will allow a class to be started as a standalone program?()
第4题:
public class Alpha1 { public static void main( String[] args ) { boolean flag; int i=0; do { flag = false; System.out.println( i++ ); flag = i < 10; continue; } while ( (flag)? true:false ); } } What is the result?()
第5题:
Public class test ( Public static void stringReplace (String text) ( Text = text.replace (‘j’ , ‘i’); ) public static void bufferReplace (StringBuffer text) ( text = text.append (“C”) ) public static void main (String args[]} ( String textString = new String (“java”); StringBuffer text BufferString = new StringBuffer (“java”); stringReplace (textString); bufferReplace (textBuffer); System.out.printLn (textString + textBuffer); ) ) What is the output?()
第6题:
interface Beta {} class Alpha implements Beta { String testIt() { return “Tested”; } } public class Main1 { static Beta getIt() { return new Alpha(); } public static void main( String[] args ) { Beta b = getIt(); System.out.println( b.testIt() ); } } What is the result?()
第7题:
class Base { Base() { System.out.print(“Base”); } } public class Alpha extends Base { public static void main( String[] args ) { new Alpha(); new Base(); } } What is the result?()
第8题:
true
false
Compilation fails.
An exception is thrown at runtime.
第9题:
args.count
args.length
args.count()
args.length()
args.getLength()
第10题:
Code fragment a.
Code fragment b.
Code fragment c.
Code fragment d.
Code fragment e.
第11题:
public static void main(String[] args){}
public static void main(String args){}
public void main(String[] args){}
public static int main(String[] args){}
第12题:
true
null
false
Compilation fails.
The code runs with no output.
An exception is thrown at runtime.
第13题:
If this source code is contained in a file called SmallProg.java, what command should be used to compile it using the JDK?() public class SmallProg { public static void main(String args[]) { System.out.println("Good luck!"); } }
第14题:
11.public class Counter{ 12.public static void main(String[]args){ 13.int numArgs=/*insert code here*/; 14.} 15.} and the command line:java Counter one fred 42 Which code,inserted at line 13,captures the number of arguments passed into the program?()
第15题:
public class Alpha{ private static Character() ids; public static void main( String[] args){ ids = new Character[args.length]; for (int i=0; i
第16题:
public class Test { public static void main( String[] args) { String foo = args[1]; String bar = args[2]; String baz = args[3]; System.out.println(“baz = “ + baz); } } And the command line invocation: java Test red green blue What is the result?()
第17题:
Which code fragments will succeed in printing the last argument given on the command line to the standard output, and exit gracefully with no output if no arguments are given?() CODE FRAGMENT a: public static void main(String args[]) { if (args.length != 0) System.out.println(args[args.length-1]); } CODE FRAGMENT b: public static void main(String args[]) { try { System.out.println(args[args.length]); } catch (ArrayIndexOutOfBoundsException e) {} } CODE FRAGMENT c: public static void main(String args[]) { int ix = args.length; String last = args[ix]; if (ix != 0) System.out.println(last); } CODE FRAGMENT d: public static void main(String args[]) { int ix = args.length-1; if (ix > 0) System.out.println(args[ix]); } CODE FRAGMENT e: public static void main(String args[]) { try { System.out.println(args[args.length-1]); }catch (NullPointerException e) {} }
第18题:
public class Test { public static void main(String [] args) { System.out.println(args.length > 4 && args[4].equals(“-d”)); } } If the program is invoked using the command line: java Test One Two Three –d What is the result?()
第19题:
Tested
Compilation fails.
The code runs with no output.
An exception is thrown at runtime.
第20题:
Compilation fails.
The code runs with no output.
An exception is thrown at runtime.
The code runs, outputing a concatenated list of the arguments passed to the program.
第21题:
Base
BaseBase
Compilation fails.
The code runs with no output.
An exception is thrown at runtime.
第22题:
1
null
0
编译错误
第23题:
java SmallProg
avac SmallProg
javac SmallProg.java
java SmallProg main