billlin001

Alias	Command	What to Type
git cleanup	git branch --merged | grep -v '*' | xargs git branch -d	git config --global alias.cleanup "!git branch --merged | grep -v '*' | xargs git branch -d"

https://stackoverflow.com/questions/17319940/how-to-escape-a-pipe-char-in-a-code-statement-in-a-markdown-table/17320389#17320389

https://stackoverflow.com/questions/17319940/how-to-escape-a-pipe-char-in-a-code-statement-in-a-markdown-table/17320389#17320389

billlin001

import java.util.Arrays;
import java.util.List;

public class GenericArray <E> {
    E[] items;
    Object[] objs;
 
    public static void main(String[] args) {
        Integer[] intArray = {1, 2, 3};
        Double[] doubleArray = {1.0, 2.0, 3.0};

billlin001

import java.util.ArrayList;
import java.util.List;

public class GenericSuperBasic {
    public static void main(String[] args) {
        List<? super Integer> superIntList = new ArrayList<Number>();
        superIntList.add(10);
//        Integer intValue = superIntList.get(0);
        Object objValue = superIntList.get(0);
        Integer intValue = (Integer) objValue;

billlin001

import java.util.Comparator;
import java.util.Iterator;
import java.util.List;

public class GenericExtendClass {
    public static void main(String[] args) {
        GenericArrayList<Integer> myIntList = new GenericArrayList<>();
        myIntList.put(1);
        System.out.println(myIntList.get());
        myIntList.add(10);

billlin001

public class GenericExtendBasic {
    public static void main(String[] args) {
        Container<Apple> apple = new Container<>();
        Container<Banana> banana = new Container<>();
        // Container<TV> tv = new Container<>(); compiler error
    }
}

class Fruit {}
class Apple extends Fruit{}

billlin001

public class GenericMethod {
    public static <T> T elementOf(T[] objects, int index) {
        return objects[index];
    }

    public static void main(String[] args) {
        String[] data = {"aaa", "bbb", "ccc"};
        String a = GenericMethod.elementOf(data, 0);
        System.out.println(a);
    }

billlin001

import java.util.Comparator;

public class MyStringComparator implements Comparator<String> {
    @Override
    public int compare(String s1, String s2) {
        return -s1.compareTo(s2);
    }
}

billlin001

import java.util.Arrays;

public class MyArrayList<E> {
    private Object[] elements;
    private int next;

    public MyArrayList(int capacity) {
        elements = new Object[capacity];
    }

billlin001

import java.util.ArrayList;
import java.util.List;

public class BasicGenericDemo {
    public static void main(String[] args) {
        // without generic
        List listWithoutGeneric = new ArrayList();
        listWithoutGeneric.add("test");
        Integer i = (Integer) listWithoutGeneric.get(0); // runtime exception

billlin001

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