1016985
Beschreibung
Quiz von webmasterMyJavaZone, aktualisiert more than 1 year ago
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Erstellt von webmasterMyJavaZone
vor mehr als 10 Jahre
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Frage 1
Frage
Which conditional statement would be best suited for determining the flow of code based on an int that may have a value between 1 and 10? The program must react differently for each value.
Antworten
-
if-else statement
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if-else-if statement with multiple if-elses
-
multiple if statements
-
switch statement
Frage 2
Frage
What Java code is used for declaring and initializing a null object?
Antworten
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Object object = new Object();
-
Object object = new Object(null);
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Object object = null;
-
Object object = null();
Frage 3
Frage
Given the following code segment, what would be the output?
int value1 = 5;
int value2 = 7;
boolean bool1 = true;
boolean bool2 = false;
if (bool1 && (( value1 < value2 )|| bool2 ) && !(bool2)) {
System.out.println("Result set one");
}
else {
System.out.println("Result set two");
}
Antworten
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Result set one
-
Result set two
Frage 4
Frage
What is the output for the following Java code segment? The text in parentheses is meant to describe the whitespace and is not part of the output.
String fiveSpaces = " ";
String SCJA = "SCJA";
String lineToDisplay = "fiveSpaces + SCJA + fiveSpaces";
System.out.println(lineToDisplay.trim());
Antworten
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SCJA (no trailing and leading spaces)
-
SCJA (five leading and trailing spaces)
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SCJA (four leading and trailing spaces)
-
fiveSpaces + SCJA + fiveSpaces
Frage 5
Frage
Given:
public class StringModifier {
public static void main (String[] args) {
String a = "Supercalifragilisticexpialidocious!";
String b = a.substring(x,y);
char [] c = {a.charAt(u), a.charAt(v)};
System.out.print(b + String.valueOf(c));
}
}
What integer declarations are needed to print the string fragile!?
Antworten
-
int x = 8; int y = 14; int u = 2; int v =33;
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int x = 10; int y = 16; int u = 4; int v =35;
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int x = 8; int y = 15; int u = 5; int v =32;
-
int x = 9; int y = 15; int u = 3; int v =34;
Frage 6
Frage
You want to remove all leading and trailing whitespace from a string.Which method invocation will allow this to occur?
Antworten
-
stringName.trim();
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stringName.trim(' ');
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stringName.trim(" ");
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stringName.trimWhiteSpace();
Frage 7
Frage
From highest precedence to lowest, which list of operators is ordered properly?
Antworten
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*, +, &&, =
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*, &&, +, =
-
*, =, &&, +
-
+, *, &&, =
Frage 8
Frage
Given the following code that uses the modulus operator, what will be printed? System.out.print((24 % 8) + (10 % 7) + (100 % 99) + (38 % 6));
Antworten
-
5
-
6
-
0312
-
0302
Frage 9
Frage
Given the following code segment testing the equality of two strings, what will be printed?
1. String string = "Dollar bill";
2. string.replace("Dollar bill","Silver dollar");
3. if ("Dollar bill".equals(string)) {
4. System.out.println ("I have a dollar bill.");
5. } else {
6. System.out.println ("I have a silver dollar.");
7. }
Antworten
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I have a dollar bill.
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I have a silver dollar.
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The code will not compile because of an error at line 2.
-
The code will not compile because of an error at line 3.
Frage 10
Frage
Which append declaration does not exist in Java 7?
Antworten
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public StringBuilder append (short s) {…}
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public StringBuilder append (int i) {…}
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public StringBuilder append (long l) {…}
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public StringBuilder append (float f) {…}
-
public StringBuilder append (double d) {…}
Frage 11
Frage
Given:
System.out.println("A" + 1 + (1 + 1) + 1);
What will print?
Antworten
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A1111
-
A121
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A13
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A31
-
Compilation error
Frage 12
Frage
Given:
StringBuilder s = new StringBuilder ("magic");
s.append("al").replace(1, 3, "us").matches("musical");
System.out.println(s);
What will be printed to standard out?
Antworten
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magical
-
musical
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true
-
The code will not compile.
Frage 13
Frage
Given:
boolean value = true;
System.out.print( true || (value=false));
System.out.println(", " + value);
What is printed to standard out?
Antworten
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true, true
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true, false
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false, true
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false, false
Frage 14
Frage
Given:
String value1 = "null";
String value2 = "null";
System.out.println(value1.equalsIgnoreCase(value2));
What result will be seen upon compilation and/or execution?
Antworten
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A NullPointerException is thrown at runtime.
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equalsIgnoreCase is not a valid method name and causes a compilation error.
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"true" is printed to standard out.
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"false" is printed to standard out.
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