000000000
0123456789
Compilation fails.
The code runs with no output.
The code enters an infinite loop.
An exception is thrown at runtime.
第1题:
A.000000000
B.0123456789
C.Compilationfails.
D.Thecoderunswithnooutput.
E.Thecodeentersaninfiniteloop.
F.Anexceptionisthrownatruntime.
第2题:
下列程序执行后的结果是______。
public class ex24
{
public static void main(String[] args)
{
int j=10;
a1: for(int i=3;i>0;i--)
{
j-=i;
int m=l;
a2: while (m<j)
{
if (i<=m)
continue a1;
j/=m++;
}
}
System.out.println(j);
}
}
下列嵌套的循环程序执行后,结果是______。 public class ax25 { public static void main(String[] args) { int sum=0; for(int i=0;i<=5;i++) { for(int j=10;j>3*i;j--) { sum+=j*i; } } System.out.println(sum); } }
A.136
B.127
C.147
D.153
第3题:
本题定义了一个长度为l0的boolean型数组,并给数组元素赋值,要求如果数组元素下标为奇数,则数组元素值 为false,否则为true。 public class javal{ pubhc static void main(String[]args){ boolean b[]= ; for(int i=0;i<10;i++){ if( ) b[i]=false; else ; } for(int i=0;i<10;i++) System.Out.print("bE"+i+"]="+b[i]+","); } }
第4题:
以下程序的运行结果为
class Prob10 {
static boolean b1;
public static void main(String [] args) {
int i1 = 11;
double f1=1.3;
do {
b1 = (f1 >4、&& (i1--< 10);
f1 += 1.0;
} while (!b 1、;
System.out.println(b1 + "," + i1 + "," + f 1、;
}
}
A. false,9,4.3
B. true,11,1.3
C. false,8,1.3
D. true,8,7.3
第5题:
现有: class Waiting implements Runnable { boolean flag=false; public synchronized void run() { if (flag) { flag=false; System.out.print ("1"); try { this.wait(); ) catch (Exception e) { } System.out.print ("2"); } else { flag=true; System.out.print ("3"); try{Thread.sleep (2000); } catch(Exception e) {} System.out.print ("4"); notify(); } } public static void main (String [] args) { Waiting w=new Waiting(); new Thread (w) .start(); new Thread (w) .start(); } } 以下哪两项是正确的?()
第6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7题:
public class Test { public int aMethod() { static int i = 0; i++; return i; } public static void main (String args[]) { Test test = new Test(); test.aMethod(); int j = test.aMethod(); System.out.println(j); } } What is the result?()
第8题:
public class test ( private static int j = 0; private static boolean methodB(int k) ( j += k; return true; ) public static void methodA(int i)( boolean b: b = i < 10 | methodB (4); b = i < 10 || methodB (8); ) public static void main (String args[])( methodA (0); system.out.printIn(j); ) ) What is the result?()
第9题:
代码输出 1 3 4
代码输出 3 4 1
代码输出 1 2 3 4
代码不会完成
第10题:
ABDCBDCB
ABCDABCD
Compilation fails.
An exception is thrown at runtime.
第11题:
0
1
2
Compilation fails.
第12题:
The program prints “0”
The program prints “4”
The program prints “8”
The program prints “12”
The code does not complete.
第13题:
下面代码的运行结果是 public class Test{ public static void main(String args[]){ for(int i=0; i<3;i++){ if(i<2) continue; System.out.println(i); } } }
A.0
B.1
C.2
D.3
第14题:
下列程序输出结果为( )。public class test { public static void main(String args[]) { int a=0; outer: for(int i=0;i<2;i++) { for(int j=0;j<2;j++) { if(j>i) { continue outer; } a++; } } System.out.println(a); }}
A.0
B.2
C.3
D.4
第15题:
有如下代码段 public class OperatorAndExceptions { public static void main(String args[]) { int i=10,j=15; System.out.println(i==j); String s1=new String("how are you!"); String s2=new String("how are you!"); System.out.println(s1==s2); } } 其输出为( )。
A.true false
B.true true
C.false true
D.false false
第16题:
现有: class Ifs { public static void main (String [] args) { boolean state=false; int i=2; if( (++i>2) && (state=true)) i++; if( (++i>4) l l (state=false)) i++; System.out .println (i); } } 结果为:()
第17题:
class Super { public int i = 0; public Super(String text) { i = 1; } } public class Sub extends Super { public Sub(String text) { i = 2; } public static void main(String args[]) { Sub sub = new Sub(“Hello”); System.out.println(sub.i); } } What is the result?()
第18题:
public class Delta { static boolean foo(char c) { System.out.print(c); return true; } public static void main( String[] argv ) { int i =0; for ( foo(‘A’); foo(‘B’)&&(i<2); foo(‘C’)){ i++ ; foo(‘D’); } } } What is the result?()
第19题:
class Waiting implements Runnable { boolean flag = false; public synchronized void run() { if (flag) { flag = false; System.out.print("1 "); try { this.wait(); } catch (Exception e) { } System.out.print("2 "); } else { flag = true; System.out.print("3 "); try { Thread.sleep(2000); } catch (Exception e) { } System.out.print("4 "); notify(); } } public static void main(String [] args) { Waiting w = new Waiting(); new Thread(w).start(); new Thread(w).start (); } } 以下哪两项是正确的?()
第20题:
class Ifs{ public static void main(String[] args){ boolean state=false; int i=1; if((++i>1)&&(state=true)) i++; System.out.println(i); } } 结果是()
第21题:
6
5
4
编译失败
第22题:
0
1
2
Compilation fails.
第23题:
5
编译失败
运行时异常被抛出
3
4