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Oracle 1Z0-829 Exam Questions
- Topic 1: Declare and instantiate Java objects including nested class objects/ Handle exceptions using try/catch/finally, try-with-resources
- Topic 2: Create Java arrays, List, Set, Map, and Deque collections/ Manipulate date, time, duration, period, instant and time-zone objects using Date-Time API
- Topic 3: Implement localization using locales, resource bundles, parse and format messages/ Read and write console and file data using I/O Streams
- Topic 4: Manipulate text, including text blocks, using String and StringBuilder classes/ Create and use enumerations with fields, methods and constructors
- Topic 5: Working with Streams and Lambda expressions/ Create, traverse, read, and write Path objects and their properties using java.nio.file API
- Topic 6: Implement overloading, including var-arg methods/ Develop thread-safe code, using different locking mechanisms and concurrent API
- Topic 7: Process Java collections concurrently including the use of parallel streams/ Packaging and deploying Java code and use the Java Platform Module System
- Topic 8: Create connections, create and execute basic, prepared and callable statements/ Create classes and records, and define and use instance and static fields and methods
- Topic 9: Use primitives and wrapper classes including Math API/ Create program flow control constructs including if/else
- Topic 10: Create and use interfaces, identify functional interfaces/ Understand variable scopes, use local variable type inference
Free Oracle 1Z0-829 Exam Actual Questions
Note: Premium Questions for 1Z0-829 were last updated On Dec. 17, 2024 (see below)
Given the code fragment:
The code fragment compares four pairs of strings using the equals() and intern() methods. The equals() method compares the content of two strings, while the intern() method returns a canonical representation of a string, which means that it returns a reference to an existing string with the same content in the string pool. The string pool is a memory area where strings are stored and reused to save space and improve performance. The results of the comparisons are as follows:
s1.equals(s2): This returns true because both s1 and s2 have the same content, ''Hello Java 17''.
s1 == s2: This returns false because s1 and s2 are different objects with different references, even though they have the same content. The == operator compares the references of two objects, not their content.
s1.intern() == s2.intern(): This returns true because both s1.intern() and s2.intern() return a reference to the same string object in the string pool, which has the content ''Hello Java 17''. The intern() method ensures that there is only one copy of each distinct string value in the string pool.
''Hello Java 17'' == s2: This returns false because ''Hello Java 17'' is a string literal, which is automatically interned and stored in the string pool, while s2 is a string object created with the new operator, which is not interned by default and stored in the heap. Therefore, they have different references and are not equal using the == operator.
Given the code fragment:
The code fragment compares four pairs of strings using the equals() and intern() methods. The equals() method compares the content of two strings, while the intern() method returns a canonical representation of a string, which means that it returns a reference to an existing string with the same content in the string pool. The string pool is a memory area where strings are stored and reused to save space and improve performance. The results of the comparisons are as follows:
s1.equals(s2): This returns true because both s1 and s2 have the same content, ''Hello Java 17''.
s1 == s2: This returns false because s1 and s2 are different objects with different references, even though they have the same content. The == operator compares the references of two objects, not their content.
s1.intern() == s2.intern(): This returns true because both s1.intern() and s2.intern() return a reference to the same string object in the string pool, which has the content ''Hello Java 17''. The intern() method ensures that there is only one copy of each distinct string value in the string pool.
''Hello Java 17'' == s2: This returns false because ''Hello Java 17'' is a string literal, which is automatically interned and stored in the string pool, while s2 is a string object created with the new operator, which is not interned by default and stored in the heap. Therefore, they have different references and are not equal using the == operator.
Given the code fragment:
Which code fragment invokes all callable objects in the workers set?
A)
B)
C)
D)
Given the code fragment:
The code fragment compares four pairs of strings using the equals() and intern() methods. The equals() method compares the content of two strings, while the intern() method returns a canonical representation of a string, which means that it returns a reference to an existing string with the same content in the string pool. The string pool is a memory area where strings are stored and reused to save space and improve performance. The results of the comparisons are as follows:
s1.equals(s2): This returns true because both s1 and s2 have the same content, ''Hello Java 17''.
s1 == s2: This returns false because s1 and s2 are different objects with different references, even though they have the same content. The == operator compares the references of two objects, not their content.
s1.intern() == s2.intern(): This returns true because both s1.intern() and s2.intern() return a reference to the same string object in the string pool, which has the content ''Hello Java 17''. The intern() method ensures that there is only one copy of each distinct string value in the string pool.
''Hello Java 17'' == s2: This returns false because ''Hello Java 17'' is a string literal, which is automatically interned and stored in the string pool, while s2 is a string object created with the new operator, which is not interned by default and stored in the heap. Therefore, they have different references and are not equal using the == operator.
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