浅谈Java内部类——静态内部类

public class StaticInnerClass {

  //外部类的非静态成员
  private int numA = 1;

  //外部类的静态成员
  private static int numB = 2;

  //静态内部类
  static class Inner {
    //内部类的非静态成员
    private int numC = 3;
    //内部类的静态成员
    private static int numD = 4;

    public void printInner(){
      System.out.println("printInner");
      System.out.println(numB);//访问外部类的静态成员
      System.out.println(numC);//访问内部类的非静态成员
      System.out.println(numD);//访问内部类的静态成员
    }
  }

  //外部类的普通成员方法
  public void printOuter(){
    System.out.println("printOuter");
  }

  public static void main(String[] args) {
    StaticInnerClass outer = new StaticInnerClass();
    outer.printOuter();
    Inner inner = new StaticInnerClass.Inner();
    inner.printInner();
    System.out.println(StaticInnerClass.numB);
    System.out.println(Inner.numD);
  }
}

public class Caculate {

  //定义一个pair类来将两个数捆绑
  static class Pair{
    private int first;
    private int second;

    public Pair(int first, int second) {
      this.first = first;
      this.second = second;
    }

    public int getFirst() {
      return first;
    }

    public int getSecond() {
      return second;
    }
  }

  //获取一个int数组中的最大和最小值
  public static Pair getMaxMin(int[] values){
    int max = Integer.MIN_VALUE;
    int min = Integer.MAX_VALUE;
    for (int i:values){
      if (min > i) min = i;
      if (max < i) max = i;
    }
    return new Pair(min,max);
  }

  public static void main(String[] args){
    int[] list = {1,3,5,2,77,23,25};
    Caculate.Pair pair = Caculate.getMaxMin(list);
    System.out.println(pair.getFirst());
    System.out.println(pair.getSecond());
    System.out.println(pair.first);
    System.out.println(pair.second);
  }
}