# Remove Boxing for String Conversions
# Description
When calling toString() on a boxed primitive no new instance of that primitive has to be created. This rule replaces occurrences of such code with a static method.
# Benefits
This rule has performance benefits.
As described above boxing the object simply to use the static toString method is a waste of memory and CPU cycles.
# Tags
# Code Changes
# Boolean
Pre
new Boolean(true).toString();
Post
Boolean.toString(true);
# Byte
Pre
new Byte(1).toString();
Post
Byte.toString(1);
# Double
Pre
new Double(1.0).toString();
Post
Double.toString(1.0);
# Float
Pre
new Float(1.0).toString();
Post
Float.toString(1.0);
# Integer
Pre
new Integer(1).toString();
Post
Integer.toString(1);
# Long
Pre
new Long(1).toString();
Post
Long.toString(1);
# Short
Pre
new Short(1).toString();
Post
Short.toString(1);
# Bytecode JDK 1.8
Pre
public void original(boolean b) {
String value = new Boolean(b).toString();
}
0 new #2 <java/lang/Boolean>
3 dup
4 iload_1
5 invokespecial #3 <java/lang/Boolean.<init>>
8 invokevirtual #4 <java/lang/Boolean.toString>
11 astore_2
12 return
Post
public void transformed(boolean b) {
String value = Boolean.toString(b);
}
0 iload_1
1 invokestatic #5 <java/lang/Boolean.toString>
4 astore_2
5 return
🛠️ Auto-refactor Available
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