public PlainDocument(Content c){
  super(c);
  putProperty(tabSizeAttribute,Integer.valueOf(8));
  defaultRoot=createDefaultRoot();
}

public PlainDocument ( Content c ) { super ( c ) ; putProperty ( tabSizeAttribute , Integer . valueOf ( 8 ) ) ; defaultRoot = createDefaultRoot ( ) ; }
constructs a plain text document . a default root element is created , and the tab size set to 8 .
