Java IO Mastery Quiz

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Java I/O basics

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Gemmarie Tapnio-Muñoz

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Java IO Mastery Quiz


Java IO Mastery QuizVersión en línea Java I/O basics por Gemmarie Tapnio-Muñoz 1 What class is typically used to read input from the keyboard in Java? a System.in b Scanner c BufferedReader d JOptionPane 2 What does System.out.println() do? a Clears the screen b Reads input from keyboard c Prints text and moves to a new line d Prints text only 3 Which package contains the Scanner class? a java.lang b java.io c java.io.scanner d java.util 4 True or False: BufferedReader is used to read input efficiently line by line. a Only for files b True c Depends on the context d False 5 Which statement imports the Scanner class from its package? a import java.Scanner; b import java.util; c import java.util.Scanner; d import java Scanner; 6 True or False: nextInt() reads a decimal number. a It reads a string not a number b Depends on locale c True d False 7 Which method reads an entire line of text in Scanner? a nextLine() b nextInt() c nextBoolean() d nextDouble() 8 Identify the purpose of a Java package. a To run programs online b To group related classes c To set memory limits d To store files on disk 9 What is the purpose of the JOptionPane class? a To read keyboard input b To format strings c To manage file I/O d To show standard dialog boxes 10 True or False: Catching exceptions is not needed with BufferedReader. a Sometimes true b True c False d Only for small files 11 Which method of Scanner reads the next line of input? a nextDouble() b nextInt() c nextLine() d nextBoolean() 12 What does System.out.print() do? a Clears the screen b Prints with a newline c Reads input d Prints text without a newline 13 What is a package in Java used for besides grouping? a To compile without RAM b To run programs without Java c To organize related classes d To store data only 14 Which are common Scanner input methods? (select all) a System.out.print() b import java.util.Scanner; c println() d nextLine(), nextInt(), nextDouble() 15 Which class handles input streams efficiently for text in Java? a Scanner b System.out c BufferedReader d JOptionPane 16 True/False: br.close() is recommended to free resources. a True b Only for network streams c False d It is optional 17 Name three classes involved in basic Java input: System.in, InputStreamReader, and ? a Scanner b JOptionPane c System.out d BufferedReader 18 Which statement imports all classes from java.util? a import java.util.; b import java.util c import java.; d import java.util.*; 19 True or False: JOptionPane is used to pop up a standard input dialog box. a False b It is for file dialogs c True d Only for output dialogs 20 What does nextBoolean() read from input? a A double b An integer c A boolean value d A string 21 Which Java language feature is used to group related classes to avoid naming conflicts? a Enums b Interfaces c Annotations d Packages 22 Identify the class that provides standard dialogs for messages in Java GUI: a System.out b Scanner c JOptionPane d BufferedReader 23 True/False: System.in is an InputStream associated with keyboard input. a Only for files b True c It is a Reader d False Feedback 1 Scanner reads tokens from input; BufferedReader reads lines; System.in is the raw stream; JOptionPane handles dialogs. 2 println outputs text and advances to the next line. 3 Scanner is in java.util. 4 BufferedReader is designed for efficient line-by-line reading. 5 Correct syntax is import followed by the full package and class. 6 nextInt() reads an integer, not a decimal (double) value. 7 nextLine() captures the full line as a String. 8 Packages organize related classes and avoid naming conflicts. 9 JOptionPane displays dialogs for user interaction. 10 BufferedReader operations typically require exception handling. 11 nextLine() consumes the rest of the current line. 12 print outputs text on the same line; println adds a newline. 13 Packages help organization and namespace management. 14 Common Scanner methods include nextLine, nextInt, nextDouble. 15 BufferedReader reads text efficiently from streams. 16 Closing the stream frees resources. 17 These three are core to reading input in examples. 18 The wildcard form imports all classes in the package. 19 JOptionPane provides dialogs for input and output. 20 nextBoolean reads true/false values. 21 Packages organize and namespace classes. 22 JOptionPane shows dialog boxes for messages. 23 System.in is the standard input stream (InputStream).

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Java IO Mastery QuizVersión en línea

por Gemmarie Tapnio-Muñoz

What class is typically used to read input from the keyboard in Java?

What does System.out.println() do?

Which package contains the Scanner class?

True or False: BufferedReader is used to read input efficiently line by line.

Which statement imports the Scanner class from its package?

True or False: nextInt() reads a decimal number.

Which method reads an entire line of text in Scanner?

Identify the purpose of a Java package.

What is the purpose of the JOptionPane class?

True or False: Catching exceptions is not needed with BufferedReader.

Which method of Scanner reads the next line of input?

What does System.out.print() do?

What is a package in Java used for besides grouping?

Which are common Scanner input methods? (select all)

Which class handles input streams efficiently for text in Java?

True/False: br.close() is recommended to free resources.

Name three classes involved in basic Java input: System.in, InputStreamReader, and ?

Which statement imports all classes from java.util?

True or False: JOptionPane is used to pop up a standard input dialog box.

What does nextBoolean() read from input?

Which Java language feature is used to group related classes to avoid naming conflicts?

Identify the class that provides standard dialogs for messages in Java GUI:

True/False: System.in is an InputStream associated with keyboard input.