Get a number from a string in java

         How to get number from a string which contains number : example
                                  string str=”123″;
                   then get a number  num=123 from string str
     int getNumber(String str){
        int i=0;
        int num=0;
        int zeroAscii = (int)’0′;
        while (i<str.length()) {
            int charAscii=(int)str.charAt(i);
        return num;


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