How to remove multiple alphabetical characters from a String and Store them in a Single String variable in Java

Question

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public class Remove {

public static void main(String arg[]) {

    int i;
    int j;
    String myString = "i love learning coding 2011";
    String argg = "ol1";
    String rdup = "";

    for (i = 0; i < argg.length(); i++) {
        for (j = 0; j < myString.length(); j++) {
            if (argg.charAt(i) == myString.charAt(j)) {
                myString.replace(myString.charAt(j), ' ');
            } else {
                rdup += myString.charAt(j);
            }
        }
    }
    System.out.println(rdup);
    System.out.println();
}

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Input: "i love learning coding 2011" output: I ve earning cding 2011 --->