匿名内部类转换lambdas取代，以极大地提高源代码的可读性

myCollection.stream().map(new Mapper<String,String>() {
  public String map(String input) {
    return new StringBuilder(input).reverse().toString();
  }
});

Predicate<String> isEmpty = new Predicate<String> {
    boolean test(String myString) {
        return myString.isEmpty();
    }
}

myCollection.stream().map(input -> new StringBuilder(input).reverse().toString());

Predicate<String> isEmpty = myString -> myString.isEmpty();

 例子:

public static List<Integer> getDiffNum(int i) {
        List<Integer> rs = new ArrayList<>();
        Integer[] numsTmp = nums.clone();
        for (int j = 0; j < i; j++) {
            int len = rand.nextInt(numsTmp.length);
            int tN = numsTmp[len];
            rs.add(tN);
            List<Integer> asList = transferArrayToList(numsTmp);
            asList.remove(len);
            Integer[] intes =new Integer[asList.size()];
            numsTmp = asList.toArray(intes);
        }
        rs.sort(new Comparator<Integer>() {

            @Override
            public int compare(Integer a, Integer b) {
                return a.compareTo(b);
            }
            
        });
        return rs;
    }

转换后:

public static List<Integer> getDiffNum(int i) {
        List<Integer> rs = new ArrayList<>();
        Integer[] numsTmp = nums.clone();
        for (int j = 0; j < i; j++) {
            int len = rand.nextInt(numsTmp.length);
            int tN = numsTmp[len];
            rs.add(tN);
            List<Integer> asList = transferArrayToList(numsTmp);
            asList.remove(len);
            Integer[] intes =new Integer[asList.size()];
            numsTmp = asList.toArray(intes);
        }
        rs.sort((a,b) -> a.compareTo(b));
        return rs;
    }