Java using contains function to match string object ignore capital case?

Question

I want that the contain function should return true even if the following are in capital letters

    List<String> pformats= Arrays.asList("odt","ott","oth","odm","sxw","stw","sxg","doc","dot","xml","docx","docm","dotx","dotm","doc","wpd","wps","rtf","txt","csv","sdw","sgl","vor","uot","uof","jtd","jtt","hwp","602","pdb","psw","ods","ots","sxc","stc","xls","xlw","xlt","xlsx","xlsm","xltx","xltm","xlsb","wk1","wks","123","dif","sdc","vor","dbf","slk","uos","pxl","wb2","odp","odg","otp","sxi","sti","ppt","pps","pot","pptx","pptm","potx","potm","sda","sdd","sdp","vor","uop","cgm","bmp","dxf","emf","eps","met","pbm","pct","pcd","pcx","pgm","plt","ppm","psd","ras","sda","sdd","sgf","sgv","svm","tgs","tif","tiff","vor","wmf","xbm","xpm","jpg","jpeg","gif","png","pdf","log");

if(pformats.contains(extension)){
    // do stuff
}

Answer 1

A Set is a better choice for a lookup.

private static final Set<String> P_FORMATS = new HashSet<String>(Arrays.asList(
    "odt,ott,oth,odm,sxw,stw,sxg,doc,dot,xml,docx,docm,dotx,dotm,doc,wpd,wps,rtf,txt,csv,sdw,sgl,vor,uot,uof,jtd,jtt,hwp,602,pdb,psw,ods,ots,sxc,stc,xls,xlw,xlt,xlsx,xlsm,xltx,xltm,xlsb,wk1,wks,123,dif,sdc,vor,dbf,slk,uos,pxl,wb2,odp,odg,otp,sxi,sti,ppt,pps,pot,pptx,pptm,potx,potm,sda,sdd,sdp,vor,uop,cgm,bmp,dxf,emf,eps,met,pbm,pct,pcd,pcx,pgm,plt,ppm,psd,ras,sda,sdd,sgf,sgv,svm,tgs,tif,tiff,vor,wmf,xbm,xpm,jpg,jpeg,gif,png,pdf,log".split(","));

if(P_FORMATS.contains(extension.toLowerCase())){
    // do stuff
}