Java牛客网输入测试用例

谁借莪１个温暖的怀抱￠ 2022-12-06 04:15 202阅读 0赞

### 文章目录 ###

*   *   *  String转为int
         *  int转为String
         *  一行输入数字
         *  多行数字
         *  多行数字，无结果不输出
         *  循环多个int输入
         *  循环 String输入
         *  多行输入 数字 + 字符串数组
         *  多行字符串输入
         *  多行字符串输入，逗号隔开

### String转为int ###

**Integer.parseInt转为int**

int i = Integer.parseInt(str);

**Integer.valueOf转为Integer，intValue再转为int**

int i = Integer.valueOf(s).intValue();

### int转为String ###

**String.valueOf**

String s = String.valueOf(i);

**Integer.toString**

String s = Integer.toString(i);

**加空串，效率低**

String s = “” + i;

--------------------

### 一行输入数字 ###

输入

1 5
    10 20

输出

6
    30

public class Main{ 
        public static void main(String[] args){ 
            Scanner sc = new Scanner(System.in);
            while(sc.hasNext()){ 
                int a = sc.nextInt();
                int b = sc.nextInt();
                System.out.println(a+b);
            }
        }
    }

### 多行数字 ###

输入

2
    1 5
    10 20

输出

6
    30

public class Main { 
        public static void main(String[] args) { 
            Scanner sc = new Scanner(System.in);
            int t = sc.nextInt();
            for(int i = 0; i < t; i++) { 
                int a = sc.nextInt();
                int b = sc.nextInt();
                System.out.println(a + b);
            }
        }
    }

### 多行数字，无结果不输出 ###

输入

1 5
    10 20
    0 0

输出

6
    30

public class Main { 
        public static void main(String[] args) { 
            Scanner sc = new Scanner(System.in);
            while (sc.hasNext()) { 
                int a = sc.nextInt();
                int b = sc.nextInt();
                if (a == 0 && b == 0) break;
                System.out.println(a + b);
            }
        }
    }

### 循环多个int输入 ###

输入

2
    4(个数) 1 2 3 4
    5(个数) 1 2 3 4 5

输出

10
    15

public class Main{ 
        public static void main(String[] args) { 
            Scanner sc = new Scanner(System.in);
            int n = sc.nextInt();
            for (int i = 0; i < n; i++) { 
                int number = sc.nextInt();
                int sum = 0;
                for (int j = 0; j < number; j++) { 
                    sum += sc.nextInt();
                }
                System.out.println(sum);
            }
        }
    }

### 循环 String输入 ###

输入

2
    4(个数) 1 2 3 4
    5(个数) 1 2 3 4 5

输出

10
    15

public class Main { 
        static public void main(String[] args) { 
            Scanner sc = new Scanner(System.in);
            while (sc.hasNext()) { 
                String input = sc.nextLine();
                String[] num = input.split(" ");
                System.out.println(Arrays.toString(num));
                int result = 0;
                for (int i = 1; i < Integer.parseInt(num[0]) + 1; i++) { 
                    result = result + Integer.parseInt(num[i]);
                }
                System.out.println(result);
            }
        }
    }

### 多行输入 数字 + 字符串数组 ###

输入

5
    c d a bb e

输出

a bb c d e

public class Main { 
        public static void main(String[] args) { 
            Scanner in = new Scanner(System.in);
            while (in.hasNext()) { 
                int n = in.nextInt();
    
                String[] ss = new String[n];
                for (int i = 0; i < n; i++)
                    ss[i] = in.next();
                Arrays.sort(ss);
                for (int i = 0; i < n - 1; i++) { 
                    System.out.print(ss[i] + " ");
                }
                System.out.print(ss[n - 1]);
            }
        }
    }

### 多行字符串输入 ###

输入

a c bb
    f dddd
    nowcoder

输出

a bb c
    dddd f
    nowcoder

public class Main { 
        public static void main(String[] args) { 
            Scanner scanner = new Scanner(System.in);
            List<String> list;
            while (scanner.hasNextLine()) { 
                String line = scanner.nextLine();
                String [] strArray = line.split(" ");
                list = Arrays.asList(strArray);
                Collections.sort(list);
                for (int i = 0; i < list.size()-1; i++) { 
                    System.out.print(list.get(i) + " ");
                }
                System.out.print(list.get(list.size()-1));
                System.out.println();
            }
        }
    }

### 多行字符串输入，逗号隔开 ###

输入

a,c,bb
    f,dddd
    nowcoder

输出

a,bb,c
    dddd,f
    nowcoder

import java.util.*;
    
    public class Main { 
        public static void main(String[] args) { 
            Scanner sc = new Scanner(System.in);
            while (sc.hasNext()) { 
                String[] input2 = sc.nextLine().split(",");
                List<String> list = Arrays.asList(input2);
                Collections.sort(list);
                int i = 0;
                // 输出
                for (String s : list) { 
                    if (i < list.size() - 1) { 
                        System.out.print(s + ",");
                        i++;
                    } else { 
                        System.out.print(s);
                    }
                }
                System.out.println("");
            }
        }
    }