public class Point<T> {    private T x;
    private T y;

    public T getX() {        return x;
    }

    public void setX(T x) {        this.x = x;
    }

    public T getY() {        return y;
    }

    public void setY(T y) {        this.y = y;
    }
}

public class Test{    public static void main(String[] args){
        // 坐标为int类型，把int类型的包装类Integer作为参数传入泛型类中
        Point<Integer> point1 = new Point<Integer>();
        point1.setX(1);
        point1.setY(1);

        // 坐标为double类型，把double类型的包装类Double作为参数传入泛型类中
        Point<Double> point2 = new Point<Double>();
        point2.setX(3.456);
        point2.setY(4.789);
    }
}

public class Container<T> {    private T variable;

    public Container () {        variable = null;
    }

    public Container (T variable) {        this.variable = variable;
    }

    public T get() {        return variable;
    }

    public void set(T variable) {        this.variable = variable;
    }

    public static void main(String[] args) {        Container<String> stringContainer = new Container<String>();
        stringContainer.set("this is a string");
    }
}

Container<String> stringContainer = new Container<String>();
stringContainer.set("this is a string");

public class Printer {    public static <T> void printArray(T[] objects) {        if (objects != null) {            for(T element : objects){
                System.out.printf("%s",element);
            }
        }
    }

    public static void main(String[] args) {
        Integer[] intArray = { 1, 2, 3, 4, 5 };
        Character[] charArray = { 'T', 'I', 'A', 'N', 'M', 'A', 'Y', 'I', 'N', 'G' };

        printArray(intArray);
        printArray(charArray);
    }
}