Java `Boolean.TRUE` vs `true` when assigning to Boolean

java.lang.Boolean-autoboxing.md

Test.java content:

public class Test {

    public Boolean mBoolean;

    public void foo() {
        this.mBoolean = Boolean.TRUE;
    }
}

Test2.java content:

public class Test2 {

    public Boolean mBoolean;

    public void foo() {
        this.mBoolean = true;
    }
}

Generated bytecode of method foo()

# javap -c Test.class

...
  public void foo();
    Code:
       0: aload_0
       1: getstatic     #2                  // Field java/lang/Boolean.TRUE:Ljava/lang/Boolean;
       4: putfield      #3                  // Field mBoolean:Ljava/lang/Boolean;
       7: return

# javap -c Test2.class

...
  public void foo();
    Code:
       0: aload_0
       1: iconst_1
       2: invokestatic  #7                  // Method java/lang/Boolean.valueOf:(Z)Ljava/lang/Boolean;
       5: putfield      #13                 // Field mBoolean:Ljava/lang/Boolean;
       8: return

So apparently it actually calls Boolean.valueOf(true) when you assign the primitive value which results in a few more instructions. Keep in mind though that Boolean.valueOf returns either Boolean.TRUE or Boolean.FALSE no instance creation is done. The performance impact (in my opinion) is thus neglible and it can be argued for either case and may be a matter of style.

The JIT might optimize the call away anyways.