如果这是一个重复的问题，我道歉。我不知道该找什么。
这是一项任务，所以我真的希望推动正确的方向，而不仅仅是得到答案。代码是反复要求用户输入返回州鸟和州花的州名。一旦用户输入＆＃34;无，＆＃34;打印出包含用户输入的每个州的州，鸟和花的摘要。目前，摘要仅打印用户输入的最后状态的信息。
我为这项草率的工作感到抱歉。我才开始学习！
# within each group repeat each point
# then slice the first and last out and
# add a variable called linegroup, which provides grouping for start and endpoints of each line
troops %<>% group_by(group) %>%
slice(rep(1:n(), each = 2)) %>%
slice(-c(1, n())) %>%
mutate(linegroup = lapply(1:(n()/2), function(x) rep(x, 2)) %>% unlist) %>%
ungroup
# create linestring sf object by summarizing the points,
# grab the last survivor and direction value of each group (i.e. the 'endpoint' value)
troops_line <- st_as_sf(troops, coords = c("long", "lat"), crs = 4326) %>%
group_by(group, linegroup) %>%
summarise(survivors = last(survivors), direction = last(direction), do_union = FALSE) %>%
st_cast("LINESTRING")
gp <- ggplot(troops_line) +
geom_sf(aes(color = direction, size = survivors), show.legend = "line")
这是第二节课：
public class StateInformation {
private String[][] stateInfo = {
{"Alabama", "Yellowhammer", "Camellia"},
{"Alaska", "Willow Ptarmigan", "Alpine Forget-Me-Not"},
{"Arizona" , "Cactus Wren", "Saguaro Cactus Blossom"},
{"Arkansas", "Northern Mockingbird", "Apple Blossom"},
{"California", "California Quail", "California Poppy"},
{"Colorado", "Lark Bunting", "Rocky Mountain Columbine"},
{"Connecticut", "American Robin", "Mountain Laurel"},
{"Delaware", "Blue Hen Chicken", "Peach Blossom"},
{"Florida", "Northern Mockingbird", "Orange Blossom"},
{"Georgia", "Brown Thrasher", "Cherokee Rose"},
{"Hawaii", "Nene", "{Pua Aloalo"},
{"Idaho", "Mountain Bluebird", "Syringa"},
{"Illinois", "Greater Prairie-Chicken", "Violet"},
{"Indiana", "Northern Cardinal", "Peony"},
{"Iowa", "Eastern Goldfinch", "Wild Rose"},
{"Kansas", "Weatern Meadowlark", "Wild Native Sunflower"},
{"Kentucky", "Northern Cardinal", "Goldenrod"},
{"Louisana", "Brown Pelican", "Louisana Iris"},
{"Maine", "Black-Capped Chickadee", "White Pine Cone and Tassel"},
{"Maryland", "Baltimore Oriole", "Black-Eyed Susan"},
{"Massachusetts", "Black-Capped Chickadee", "Mayflower"},
{"Michigan", "American Robin", "Apple Blossom"},
{"Minnesota", "Common Loon", "Pink and White Lady Slipper"},
{"Mississippi", "Northern Mockingbird", "Magnolia"},
{"Missouri", "Eastern Bluebird", "White Hawthorn Blossom"},
{"Montana", "Western Meadowlark", "Bitterroot"},
{"Nebraska", "Western Meadowlark", "Goldenrod"},
{"Neveda", "Mountain Bluebird", "Sagebrush"},
{"New Hampshire", "Purple Finch", "Pink Lady's Slipper"},
{"New Jersey", "Eastern Goldfinch", "Violet"},
{"New Mexico", "Greater Roadrunner", "Yucca"},
{"New York", "Eastern Bluebird", "Rose"},
{"North Carolina", "Northern Cardinal", "Dogwood"},
{"North Dakota", "Western Meadowlark", "Wild Prairie Rose"},
{"Ohio", "Northern Cardinal", "White Trillium"},
{"Oklahoma", "Scissor-Tailed Flycatcher", "Mistletoe"},
{"Oregon", "Western Meadowlark", "Oregon Grape"},
{"Pennslyvania", "Ruffed Grouse", "Mountain Laurel"},
{"Rhode Island", "Rhode Island Red Chicken", "Violet"},
{"South Carolina", "Carolina Wren", "Yellow Jessamine"},
{"South Dakota", "Ring-necked Pheasant", "American Pasque"},
{"Tennessee", "Northern Mockingbird", "Passion Flower"},
{"Texas", "Northern Mockingbird", "Ennis"},
{"Utah", "California Gull", "Sego Lily"},
{"Vermont", "Hermit Thrush", "Red Clover"},
{"Virginia", "Northern Cardinal", "American Dogwood"},
{"Washington", "Willow Goldfinch", "Coast Rhododendron"},
{"West Virginia", "Northern Cardinal", "Rhododendron"},
{"Wisconsin", "American Robin", "Wood Violet"},
{"Wyoming", "Western Meadowlark", "Indian Paintbrush"},
};//End array initialization
public StateInformation() {
}
public String[][] getStateInfo(){
return stateInfo;
}
public void setState(String[][] state) {
this.stateInfo = stateInfo;
}
}
//End of Class
答案 0 :(得分：2)
要获取活动摘要，您必须将每个州存储在一个集合中。这里使用Set来避免重复 显示存储在Set中的每个状态的示例代码，然后迭代Set：
public class TestStateInformation {
public static void main(String[] args) {
StateInformation states = new StateInformation();
String[][] state = states.getStateInfo();
// Inserting scanner & variable.
Scanner scanner = new Scanner(System.in);
Set<Integer> positions = new HashSet<Integer>();
while (true) {
// Prompt the user to input a state name.
System.out.println("Please enter a state or None to exit: ");
// Read the state entered by user, including leading/trailing white
// spaces.
String stateInfo = scanner.nextLine();
// If loop to end if None is entered.
if (stateInfo.equalsIgnoreCase("None")) {
System.out.println(
"***** Thank you! *****" + '\n' + "A summary report for each State, Bird, and Flower is: \n");
for (Integer p : positions) {
System.out.println(getState(p, state) + ", " + getBird(p, state) + ", " + getFlower(p, state)
+ '\n');
}
System.out.println("Please visit our site again!");
break;
} else {
int position = getStatePosition(state, stateInfo);
if (position != -1) {
positions.add(position);
System.out.println("New size=" + positions.size());
System.out.println("Bird: " + getBird(position, state) + '\n' + "Flower: "
+ getFlower(position, state) + '\n');
}
}
}
}// end while loop
使用示例输出：
***** Thank you! *****
A summary report for each State, Bird, and Flower is:
Alaska, Willow Ptarmigan, Alpine Forget-Me-Not
California, California Quail, California Poppy
Florida, Northern Mockingbird, Orange Blossom
Please visit our site again!
答案 1 :(得分：0)
你似乎并不太遥远。你可以按照要求写出每个州的信息 - 所以你所遗漏的是最后的那些摘要吗？
您需要的是某种数据结构，以便存储有关用户询问的状态的信息。那么你需要为每个问题存储的是一个数字 - 即该状态的索引。如果您能够将所有这些存储在列表中，那么最后，您可以简单地遍历该列表，并打印出每个列表的相关信息。
由于像String[]这样的常规数组无法调整大小，因此您可能希望使用类似ArrayList<Integer>的内容。每次用户请求有关新状态的信息时，使用它来存储新的信息行。
注意：这假设您需要记录用户要求的内容;如果你不想在用户事实上多次要求相同的状态时重复相同的状态，你可以使用一些Dictionary的实现，这将只允许每个状态的一个实例包含在最终列表。
希望这足以帮助你......