question: public Enumeration unused ( ) { Vector unUsed = new Vector ( ) ; Enumeration names = used . keys ( ) ; while ( names . hasMoreElements ( ) ) { String name = ( String ) names . nextElement ( ) ; Boolean isUsed = ( Boolean ) used . get ( name ) ; if ( ! isUsed . booleanValue ( ) ) unUsed . addElement ( name ) ; } return unUsed . elements ( ) ; }
target:  Returns all unused macros.