18 Strings & Equality questions from the Java bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.
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A.the property that a String object's contents can never change after creation, so any modification yields a new object
B.the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
C.the comparison that tests whether two references point to the exact same object in memory rather than equal content
D.the method that compares two objects for logical content equality rather than reference identity
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2. Which term means: "the property that a String object's contents can never change after creation, so any modification yields a new object"?
Junior
A.hashCode contract
B.== operator on objects
C.StringBuilder
D.String immutability
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3. Which statement is correct?
Junior
A.String immutability — a mutable sequence of characters used to efficiently build or modify text without creating many intermediate objects
B.String immutability — the JVM-managed cache of interned string literals that lets identical literals share a single object
C.String immutability — the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
D.String immutability — the property that a String object's contents can never change after creation, so any modification yields a new object
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4. What is String pool?
Mid
A.the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
B.the JVM-managed cache of interned string literals that lets identical literals share a single object
C.the comparison that tests whether two references point to the exact same object in memory rather than equal content
D.the method that compares two objects for logical content equality rather than reference identity
Answer + AI explanation with Pro
5. Which term means: "the JVM-managed cache of interned string literals that lets identical literals share a single object"?
Mid
A.String pool
B.equals method
C.== operator on objects
D.StringBuilder
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6. Which statement is correct?
Mid
A.String pool — the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
B.String pool — the comparison that tests whether two references point to the exact same object in memory rather than equal content
C.String pool — the method that compares two objects for logical content equality rather than reference identity
D.String pool — the JVM-managed cache of interned string literals that lets identical literals share a single object
Answer + AI explanation with Pro
7. What is equals method?
Junior
A.the comparison that tests whether two references point to the exact same object in memory rather than equal content
B.the method that compares two objects for logical content equality rather than reference identity
C.a mutable sequence of characters used to efficiently build or modify text without creating many intermediate objects
D.the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
Answer + AI explanation with Pro
8. Which term means: "the method that compares two objects for logical content equality rather than reference identity"?
Junior
A.equals method
B.hashCode contract
C.StringBuilder
D.String pool
Answer + AI explanation with Pro
9. Which statement is correct?
Junior
A.equals method — the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
B.equals method — a mutable sequence of characters used to efficiently build or modify text without creating many intermediate objects
C.equals method — the method that compares two objects for logical content equality rather than reference identity
D.equals method — the property that a String object's contents can never change after creation, so any modification yields a new object
Answer + AI explanation with Pro
10. What is == operator on objects?
Mid
A.the comparison that tests whether two references point to the exact same object in memory rather than equal content
B.the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
C.a mutable sequence of characters used to efficiently build or modify text without creating many intermediate objects
D.the property that a String object's contents can never change after creation, so any modification yields a new object
Answer + AI explanation with Pro
11. Which term means: "the comparison that tests whether two references point to the exact same object in memory rather than equal content"?
Mid
A.== operator on objects
B.hashCode contract
C.equals method
D.String immutability
Answer + AI explanation with Pro
12. Which statement is correct?
Mid
A.== operator on objects — the comparison that tests whether two references point to the exact same object in memory rather than equal content
B.== operator on objects — the JVM-managed cache of interned string literals that lets identical literals share a single object
C.== operator on objects — the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
D.== operator on objects — the method that compares two objects for logical content equality rather than reference identity
Answer + AI explanation with Pro
13. What is hashCode contract?
Mid
A.the method that compares two objects for logical content equality rather than reference identity
B.the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
C.the JVM-managed cache of interned string literals that lets identical literals share a single object
D.the comparison that tests whether two references point to the exact same object in memory rather than equal content
Answer + AI explanation with Pro
14. Which term means: "the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections"?
Mid
A.equals method
B.hashCode contract
C.String immutability
D.String pool
Answer + AI explanation with Pro
15. Which statement is correct?
Mid
A.hashCode contract — a mutable sequence of characters used to efficiently build or modify text without creating many intermediate objects
B.hashCode contract — the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
C.hashCode contract — the method that compares two objects for logical content equality rather than reference identity
D.hashCode contract — the comparison that tests whether two references point to the exact same object in memory rather than equal content
Answer + AI explanation with Pro
16. What is StringBuilder?
Mid
A.the property that a String object's contents can never change after creation, so any modification yields a new object
B.the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
C.a mutable sequence of characters used to efficiently build or modify text without creating many intermediate objects
D.the method that compares two objects for logical content equality rather than reference identity
Answer + AI explanation with Pro
17. Which term means: "a mutable sequence of characters used to efficiently build or modify text without creating many intermediate objects"?
Mid
A.equals method
B.== operator on objects
C.hashCode contract
D.StringBuilder
Answer + AI explanation with Pro
18. Which statement is correct?
Mid
A.StringBuilder — the method that compares two objects for logical content equality rather than reference identity
B.StringBuilder — the rule that two objects considered equal must return the same integer hash, required for correct behavior in hash-based collections
C.StringBuilder — a mutable sequence of characters used to efficiently build or modify text without creating many intermediate objects
D.StringBuilder — the comparison that tests whether two references point to the exact same object in memory rather than equal content
Answer + AI explanation with Pro
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