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Equals method recursion

How can I implement an equals method in java recursively?

12/7/2021 3:00:18 AM

snaj

2 Answers

New Answer

+1

class ArrayWrap { int[] a; ArrayWrap(int[] a) { java.util.Objects.requireNonNull(a); this.a = a; } public boolean equals( ArrayWrap other) { return this == other || a.length == other.a.length && equalsHelper(other,0); } private boolean equalsHelper( ArrayWrap p, int idx) { if (idx == a.length) return true; return equalsHelper(p,idx+1) && a[idx] == p.a[idx]; } public static void main(String[] args) { int[] a = new int[]{1,2,3,4,5}; int[] b = new int[]{1,2,3,4,5}; ArrayWrap wrapA = new ArrayWrap(a); ArrayWrap wrapB = new ArrayWrap(b); System.out.println( wrapA.equals( wrapB) ); } }

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Why do you want to implement equals recursively?