---
title: "Meaning & Key Takeaway of: “public class Merge { private static…"
description: "\"“public class Merge { private static Comparable[] aux; // auxiliary array for merges public static void sort(Comparable[] a) { aux = new Comparable[a.l..."
image: "https://sms4smile.com/quotes/i/fa3/robert-sedgewick-81232_quote_public-class-merge-private-static-compar_1184442.jpg"
---

#  “public class Merge { private static Comparable\[\] aux; //…

![““public class Merge { private static Comparable[] aux; // auxiliary array for merges public static void sort(Comparable[] a) { aux = new Comparable[a.length]; // Allocate space just once. sort(a, 0, a.length - 1); } private static void sort(Comparable[] a, int lo, int hi) { // Sort a[lo..hi]. if (hi” quote by Robert Sedgewick](https://sms4smile.com/quotes/i/fa3/robert-sedgewick-81232_quote_public-class-merge-private-static-compar_1184442.jpg)   [Download](https://sms4smile.com/quotes/i/fa3/robert-sedgewick-81232_quote_public-class-merge-private-static-compar_1184442.jpg) [Open image](https://sms4smile.com/quotes/i/fa3/robert-sedgewick-81232_quote_public-class-merge-private-static-compar_1184442.jpg)

> ““public class Merge { private static Comparable\[\] aux; // auxiliary array for merges public static void sort(Comparable\[\] a) { aux = new Comparable\[a.length\]; // Allocate space just once. sort(a, 0, a.length - 1); } private static void sort(Comparable\[\] a, int lo, int hi) { // Sort a\[lo..hi\]. if (hi <= lo) return; int mid = lo + (hi - lo)/2; sort(a, lo, mid); // Sort left half. sort(a, mid+1, hi); // Sort right half. merge(a, lo, mid, hi); // Merge results (code on page 271). } }””

[Robert Sedgewick](https://sms4smile.com/quotes/author/robert-sedgewick/)

## About This Quote

This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.

The code shows a classic top‑down merge sort that allocates an auxiliary array once and recursively sorts subarrays before merging them.

**In simple terms:** Merge sort uses divide and conquer with a reusable buffer.

Key Takeaway

Allocate buffer once, then sort recursively.

Themes

algorithms sorting efficiency

Mood

analytical instructional

Type

technical educational

When to use this quote

- sorting large datasets
- educational demos
- performance tuning

Key Concepts

divide and conquer recursion auxiliary storage

Questions to Reflect On

- How does allocating the buffer once improve performance?
- When is recursion preferable to iteration?

A Different Perspective

Requires extra memory proportional to input size.

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[Array Merges](https://sms4smile.com/quotes/about/array-merges-3487973/) [Mid Sort](https://sms4smile.com/quotes/about/mid-sort-3487975/) [Sort Comparable](https://sms4smile.com/quotes/about/sort-comparable-3487974/) [Static Comparable](https://sms4smile.com/quotes/about/static-comparable-3487976/) [Technology](https://sms4smile.com/quotes/about/technology/) [Void Sort](https://sms4smile.com/quotes/about/void-sort-3487972/)

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