華為Java面試題
第一部分:選擇題
QUESTION NO: 1
1、public class Test {
public static void changeStr(String str){
str="welcome";
}
public static void main(String[] args) {
String str="1234";
changeStr(str);
tln(str);
}
}
please write the output result :
QUESTION NO:2
1. public class Test {
2. static boolean foo(char c) {
3. t(c);
4. return true;
5. }
6. public static void main( String[] argv ) {
7. int i =0;
8. for ( foo(A); foo(B)&&(i<2); foo(C)){
9. i++ ;
10. foo(D);
12. }
13. }
14. }
What is the result?
A. ABDCBDCB
B. ABCDABCD
C. Compilation fails.
D. An exception is thrown at runtime.
QUESTION NO: 3
1. class A {
2. protected int method1(int a, int b) { return 0; }
3. }
Which two are valid in a class that extends class A? (Choose two)
A. public int method1(int a, int b) { return 0; }
B. private int method1(int a, int b) { return 0; }
C. private int method1(int a, long b) { return 0; }
D. public short method1(int a, int b) { return 0; }
E. static protected int method1(int a, int b) { return 0; }
QUESTION NO: 4
1. public class Outer{
2. public void someOuterMethod() {
3. // Line 3
4. }
5. public class Inner{}
6. public static void main( String[]argv ) {
7. Outer o = new Outer();
8. // Line 8
9. }
10. }
Which instantiates an instance of Inner?
A. new Inner(); // At line 3
B. new Inner(); // At line 8
C. new r(); // At line 8
D. new r(); // At line 8//new Outer() Inner()
QUESTION NO: 5
Which method is used by a servlet to place its session ID in a URL that is written to the servlet’s response output stream?
A. The encodeURL method of the HttpServletRequest interface.
B. The encodeURL method of the HttpServletResponse interface.
C. The rewriteURL method of the HttpServletRequest interface.
D. The rewriteURL method of the HttpServletResponse interface.
QUESTION NO: 6
Which two are equivalent? (Choose two)
A. <%=>
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