Common multiple choice questions in Java written test

1. Known expression int m[] = {0,1,2,3,4,5,6}; The value of the following expression and the array The lengths are equal ()

A m.length()

B. m.length

C. m.length() 1

D. m.length 1

Answer: B

Analysis: The length of the array is .length

2. Below Are those claims legitimate? ()

A long l = 4990

B. int i = 4L

C. float f = 1.1

D. double d = 34.4

Answer: AD

Analysis: B int belongs to integer type and should be int=4 C should be float f=1.1f

3. Select the correct java expression () from the following options

A int k=new String("aa")

B. String str = String("bb" )

C. char c=74;

D. long j=8888;

Answer: CD

Analysis: A requires forced type conversion B String str =new String("bb")

4. The output result of the following code is

System.out.println(""+("12"=="12"&&"12".equals("12"))); (“12”==”12”&&”12”.equals(“12”)) “12”==”12”&&”12”.equals(“12”)

true

false

5. Which of the following operators contain short-circuit operation mechanism? Please select: ()

A &

B. &&

#C. |

D. ||

Answer: BD

Analysis: A C is logic and calculation

6. Which of the following functions is the key to public void example(){....} load function? ()

A private void example(int m){...}

B. public int example(){...}

C. public void example2(){...}

D. public int example(int m.float f){...}

Answer: AD

Analysis: BC defines a new function

7. Given a certain java program fragment, after the program is run, the output result of j is ()

int i=1； Int j=i++； If（（j>++j）&&(i++==j)）{j+=i:} System.out.println(j);

A 1

B. 2

C. 3

D. 4

Answer: B

Analysis: i is quoted first. i is added first and then quoted

8. In java, no matter what the test condition is, the following () loop will be executed at least once.

A for

B. do...while

C. while

D. while...do

Answer: B

Analysis: ACD does not necessarily cycle

9. Print result:

package cn.wuliaokankan; public class smaillT{ public static void main(String args[]){ smaillT t=new smaillT(); int b = t.get(); System.out.println(b); } public int get() { try { return 1; }finally{ return 2; } }

Output result:

2

10. Indicate the running result of the following program

int i=9; switch (i) { default: System.out.println("default"); case 0: System.out.println("zero"); break; case 1: System.out.println("one"); break; case 2: System.out.println("two"); break; }

Print result:

zero

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