How to sort an ArrayList in java?

import java.util.ArrayList;
import java.util.Collections;

public class ArrayListSort {

public static void main(String[] args) {
ArrayList<String> list = new ArrayList<String>();
list.add(“cc”);
list.add(“AA”);
list.add(“bb”);
list.add(“CC”);
list.add(“11”);
list.add(“33”);
list.add(“22”);
list.add(“BB”);
list.add(“aa”);
System.out.println(“Before Sorting”);
for (String temp : list) {
System.out.println(temp);
}
Collections.sort(list);
System.out.println(“After Sorting”);
for (String temp : list) {
System.out.println(temp);
}
}

}

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How to remove the letters from the bellow String? String str = “0N1A2G3A4R5A6J7U89”;

public class StringDemoString {

public static void main(String[] args) {
String str = “0N1A2G3A4R5A6J7U89”;
str = str.replaceAll(“[^0-9]”, “”);
System.out.println(str);
}

}

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How to remove the numbers from the below String? String str = “0N1A2G3A4R5A6J7U89”;

public class StringDemoString {

public static void main(String[] args) {
String str = “0N1A2G3A4R5A6J7U89”;
str = str.replaceAll(“[^a-zA-Z]”, “”);
System.out.println(str);
}

}

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