# Replace Equality Check with isEmpty()
# Description
This rule replaces comparisons of length() or size() with 0 with a call to isEmpty(). Any occurrences of such a comparison will be replaced, regardless of surrounding control structure.
# Benefits
The time complexity of any isEmpty() method implementation should be O(1) whereas some implementations of size() can be O(n). Thus, using this rule provides performance benefits.
# Tags
# Code Changes
# size, length
Pre
Map<String, String> m = new HashMap<>();
if(m.size() == 0);
String s = "";
if(s.length() == 0);
Post
Map<String, String> m = new HashMap<>();
if(m.isEmpty());
String s = "";
if(s.isEmpty());
Use a Java Refactoring Tool
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You can apply this refactoring for free with the jSparrow Eclipse IDE plug-in.
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