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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