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Dev.to
Dev.to
7/15/2026
`new` Operator in Java

`new` Operator in Java

Short summary

A beginner-friendly tutorial explaining Java's new operator: how it allocates heap memory, invokes constructors, and returns object references. It contrasts Java's automatic garbage collection with C++'s manual delete, covers GC eligibility via nulling references and scope exit, and compares new with reflection-based object creation using Constructor::newInstance(). The article is not AI-related.

  • The new operator allocates heap memory, runs the constructor, and returns a reference — Java has no delete operator
  • Objects become GC-eligible when no live references remain, though removal timing is JVM-controlled
  • Reflection-based creation via Constructor::newInstance() is preferred over the deprecated Class::newInstance() since Java 9

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