Common methods, properties, etc. of string classes in Java

 PackageHead18; Public classjava09 { Public Static voidMain (string[] args) {String s= "Hello,where is you from?" "+" is you American?                Do you from the China? " + "No,i am from Australian"; //statistical spaces and "re" strings        intN=0,n1=0; String S1="";  for(intI=0;i<s.length () -2;i++) {String R=s.substring (i, i+2); if(R.equals ("Re") ) {n++; }        }         for(intI=0;i<s.length () -1;i++) {String R=s.substring (i, i+1); if(R.equals ("") ) {N1++; }        }        //Replace textString s3=s; S3=s3.replaceall ("Om", "en");                        System.out.println (S3); //Split characterString a[]=s.split ("\ \?");  for(inti = 0; I <a.length;i++) {System.out.println (a[i]); }                //A and a letter exchangeString s11[]=Newstring[s.length ()]; String S2="";  for(intI=0;i<s.length () -1;i++) {S11[i]=s.substring (i,i+1); if(S11[i].equals ("A") ) {S11[i]= "a"; }Else if(S11[i].equals ("a") ) {S11[i]= "A"; } S2=s2+S11[i];        } System.out.println (S2);        SYSTEM.OUT.PRINTLN (n);                    SYSTEM.OUT.PRINTLN (N1); }}

Common methods, properties, etc. of string classes in Java