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Answer 11


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Answer 10

False. The code in Listing 6 produces the screen output with the errors shown in Figure 10 .

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Answer 9

False. The code in Listing 5 produces the screen output shown in Figure 8 . The parse method is not static in the JSONParser class.

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Answer 8


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Answer 7

True. Even though it is not necessary to instantiate an object of a class to call a static method belonging to that class, it is possible to instantiate an object of the JSONValue class and to call the static parse method on that object.

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Answer 6

False. The code in Listing 2 produces the screen output with the compiler errors shown in Figure 4 . The return value from the parse method must be cast from type Object to type JSONObject to store it in a variable of type JSONObject .

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Answer 5

False. The code in Listing 1 produces the screen output with the compiler errors shown in Figure 2 . The json-simple library does not define a class named JSONString .

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Answer 4

False. The json-simple library does not define a class named JSONString . Both parse methods return a reference of type java.lang.Object . However, it is actually a reference to an object of the class JSONObject , which is a subclass of Object several levels down. The reference must be downcast to type JSONObject in order to call some of the methods defined in the JSONObject class or to store the object's reference in a variable of type JSONObject .

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Answer 3

False. The parse method belonging to the class named JSONParser is not declared static . Therefore, it is an instance method . Instance methods can only be called on an object instantiated from the class.

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Answer 2

False. The parse method that is defined in the class named JSONValue is a static method. Static methods belonging to a class can be called without the requirement toinstantiate an object of the class.

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Answer 1

False. The class named JSONValue also defines a method named parse that can be used to decode or parse a JSON string.

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This section contains Figures that may be referred to by one or more questions or answers.

Figure 1

Joe 21

Figure 2

Code01.java:8: error: cannot find symbol import org.json.simple.JSONString;^ symbol: class JSONStringlocation: package org.json.simple Code01.java:20: error: cannot find symbolJSONString jsonString02 = JSONValue.parse(jsonString0101); ^symbol: class JSONString location: class Code01Code01.java:20: error: cannot find symbol JSONString jsonString02 = JSONValue.parse(jsonString0101);^ symbol: variable jsonString0101location: class Code01 Note: Code01.java uses unchecked or unsafe operations.Note: Recompile with -Xlint:unchecked for details. 3 errorsError: Could not find or load main class Code01

Questions & Answers

a perfect square v²+2v+_
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Differences Between Laspeyres and Paasche Indices
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At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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