program for remove unnecessary space from a given input string. import java.util.*; import java.lang.*; import java.io.*; import java.util.StringTokenizer; class MyStrRemoveMultSpaces { public static void main(String a[]){ Scanner sc=new Scanner(System.in); String str = sc.nextLine(); StringTokenizer st = new StringTokenizer(str, \" \"); StringBuffer sb = new StringBuffer(); while(st.hasMoreElements()){ sb.append(st.nextElement()).append(\" \"); } System.out.println(sb.toString().trim()); } } Solution program for remove unnecessary space from a given input string. import java.util.*; import java.lang.*; import java.io.*; import java.util.StringTokenizer; class MyStrRemoveMultSpaces { public static void main(String a[]){ Scanner sc=new Scanner(System.in); String str = sc.nextLine(); StringTokenizer st = new StringTokenizer(str, \" \"); StringBuffer sb = new StringBuffer(); while(st.hasMoreElements()){ sb.append(st.nextElement()).append(\" \"); } System.out.println(sb.toString().trim()); } }.