java process control

Determine whether a certain year is a leap year

package com;

import java.util.Scanner;

public class Msj {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.println("Please enter a year:"); //To The console outputs a prompt message

long year;

try {

year = scan.nextLong();

if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { // It is a leap year

System.out.print(year + "It is a leap year!");

} else { // Not a leap year

System.out.print(year + "Not a leap year!");

}

} catch (Exception e) {

System.out.println("The year you entered is not a valid year!");

}

}

}

Result:

Verify the legitimacy of login information

package com;

import java.util.Scanner;

public class Msj {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);//Create scanner
System.out.println("Please enter the login user Name: ");
String username = scan.nextLine();//Receive the user's login name
System.out.println("Please enter the login password: ");
String password = scan. nextLine();//Receive the user’s login password
if (!username.equals("mr")) {// Determine the legality of the username
System.out.println("The username is illegal. ");
    } else if (!password.equals("mrsoft")) {// Determine the validity of the password
        System.out.println("The login password is incorrect.");
      } else { // If the above two conditions are judged, the login verification will be passed by default.
          System.out.println("Congratulations, your login information has passed the verification.");
                                                                                                   
##Result

Assign department to new employee

package com;

import java.util.Scanner;

public class Msj {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("Please enter the new employee’s name Name: ");
String name = scan.nextLine();//Receive employee name
System.out.println("Please enter the programming language for the new employee:");
String language = scan.nextLine();//Receive the programming language for employee application
//Determine the department to which the employee is assigned based on the programming language
switch (language.hashCode()) {
case 3254818://java's ha Hash code
              case 2301506:// Java hash code
          case 2269730:// JAVA hash code
          System.out.println("Employee"+name+" is assigned to the Java program development department . ");
break;
case 3104:// c# hash code
case 2112:// C# hash code
System.out.println("Employee"+name+" Assigned to the C# project maintenance group. "); case 9745901: // ASP.NET hash code
System.out.println("Employee "+name+" is assigned to the Asp.net program testing department.");
break;
default:
              System.out.println("This company does not need program developers in " + language + " language. ");
}
}
}

Use switch statement to calculate discount based on consumption amount

package com;

import java.util.Scanner;

public class Msj {
public static void main(String[] args) {
float money = 1170; // Amount
String rebate = ""; // Discount
if (money > 200) {
int grade = (int) money / 200; // Grade
switch (grade) { // Calculate discount ratio based on grade
case 1:
rebate = "Nine Five Fold ";
Break;
Case 2:
Rebate =" 10 % off ";
Break;
Case 3:
Rebate =" 850 % ";
Break ;
                  case 4:                                 rebate = "83% off"; rebate = "20% off";
                break;
                    case 6:
Rebate = "70 %";
Break;
Case 7:
Rebate = "Seven Five Fum";
Break 30% off";
                                                                                                                                              break; case 10:
rebate = "35% off";
                                                                                                                                                  using       using       using           using       using using       through’s ’ through ’ s ’ through ’ s ’ through ‐ to ‐ ′‐‐‐‐‐ and } to "Your accumulated consumption amount is: " + money);// Output consumption amount
System.out.println("You will enjoy " + rebate + " discount! "); // Output discount ratio
}
}

Result:




Determine the season of the user input month

package com;

import java.util.Scanner;

public class Msj {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in); // Create a scanner
// Prompt the user to enter the month
System.out.println("Please enter a month, I can tell you which season it belongs to.");
int month = scan.nextInt(); // Receive user input
switch (month) { // Determine which season the month belongs to
            case 12:
                        case 1:  
                case 2:
                                            ’         ’s ’ s ’         ‐ ‐ ‐ ‐‐‐ case 12: ​ ​                                                                                                                      ;
case 3:
case 4:
case 5:
System.out.print("The month you entered belongs to spring");
break;
case 6:
          case 7:
                                                                                                                  use using   using       using         use using ’ s ’ through     through ’s ’ s ‐   ‐   ‐ and                                                                                case 10:
case 11:
          System.out.print("The month you entered belongs to autumn");
              break;
                                    System.out.print(""                                                                                         Month? ");
}
}
}

Result



##Use the while loop statement and the increment operator to loop Traverse the array

package com;

import java.util.Scanner;

public class Msj {

public static void main(String[] args) {

// Create a bird array

String [] Aves = New String [] {"Egret", "Yellow 鹂", "Parrot", "Crow", "Magpie",

"Bird" ", "Lark" };

int index = 0;//Create index variable

System.out.println("There are many birds in my garden, including: ");

while ( index         System.out.println(aves[index++]);//Increase the index value
                                                                            ’ ’s ’ s ’ s ’ ‐ ‐ ‐ ‐ ‐ to #Result:




Use for loop to output Yang Hui triangle

package com;

import java.util.Scanner;

public class Msj {
public static void main(String[] args) {
int triangle[][]=new int[10][];//Create a two-dimensional array
// Traverse the first level of the two-dimensional array
        for (int i = 0; i           triangle[i]=new int[i+1];// Initialize the second level The size of the array
// Traversing the second layer of the array
For (int j = 0; j & lt; = i; j ++) {
// Assign the array elements on both sides to 1
if(i==0||j==0||j==i){
                                                    triangle[i][j]=1; [i][j]=triangle[i-1][j]+triangle[i-1][j-1];
              }
          System.out.print(triangle[i][j]+ “\t”);



##Use nested loops to output the multiplication table on the console

package com;

import java.util.Scanner;

public class Msj {

public static void main(String[] args) { for(int i=1;i             for(int j=1;j                                                                                                                                                                   use using         use using ’ using ’ s ’ using ’ s using using ’ s using ’ s through ’ s ’       ‐ ‐ ‐ ‐ ‐ ‐ ‐ 1 out.print(j+"*"+i+"="+i*j+"\t");

                                                       

                  System.out.println();// Line break in the outer loop

                                   ## }

}

Result:




Use a while loop to calculate 1+1/2!+1/3!…1/20!

package com;

import java.math.BigDecimal;
import java.util.Scanner;

public class Msj {

public static void main( String[] args) {

BigDecimal sum = new BigDecimal(0.0); // and BigDecimal factorial = new BigDecimal(1.0); // Calculation result of factorial term

int i = 1; // Loop increment

while (i sum = sum.add(factorial); // Accumulate the sum of factorials

++i; // Add 1 to i

factorial = factorial.multiply(new BigDecimal(1.0 / i)); // Calculate the factorial term

} }
System.out.println("1+1／2!+1／3!···1／ The calculation result of 20! is equal to: \n" + sum); // Output the calculation result

}

}

Result:




Use a for loop to output a hollow diamond

package com;

import java.math.BigDecimal;
import java.util.Scanner;

public class Msj {
public static void main(String[] args) {
printHollowRhombus(6);
}
public static void printHollowRhombus(int size) {
if ( size % 2 == 0) {
                                                                        ## j = size / 2 + 1; j > i + 1; j--) {
              System.out.print(" ");// Output the blank space in the upper left corner
        }
            for ( int j = 0; j                       if (j == 0 || j == 2 * i) {
                        System.out.print("* "); // Output the edge of the upper half of the rhombus
            } else {
              System.out.print(" "); // Output the upper half of the rhombus hollow
                                        using         using using ’     using using     through through out through out through ’'s' out through ‐ through ‐ to ‐‐ ‐‐‐‐‐ and ‐ to System.out. Println (""); // Change
}
for (int i = size /2+1; i & lt; size; i ++) {
for (int j = 0; j & lt; i - size/ 2; j ++) {
System.out.print (""); // Output the lower left corner of the diamond -shaped left corner
}
for (int j = 0; j & lt; 2 * size - 1- 0 Lower half edge
                                                                                                                                                              Lower half edge System.out.println("" ); //Newline
}
}
}

Result:



##Termination loop body

package com;

import java.math.BigDecimal;
import java.util.Scanner;

public class Msj {
public static void main(String[] args) {
System.out.println("\n-------------Interrupt single-level loop Example-------------");
// Create an array
String[] array = new String[] { "Egret", "Red-crowned Crane", "Oriole", "Parrot", "Crow", "Magpie",
"Eagle", "Cuckoo", "Eagle", "Graybird", "Eagle", "Lark" };
System.out .println("Before you find the first eagle, tell me what birds there are.");
for (String string : array) { // foreach traverses the array
if (string.equals("Eagle ")) // If an eagle is encountered
                                                                                                                                                                                    Break
System.out.println("\n\n-------------Example of interrupting double-layer loop-------------");
// Create the results of the results
int [] [] [] myscores = new int [] [] {{67, 78, 63, 22, 66}, {55, 68, 78, 95, 44}, {95 , 97, 92, 93, 81 } };
System.out.println("Baby’s test scores this time:\nMath\tChinese\tEnglish\tArt\tHistory");
                                                             for (int[] is : myScores) { // Traverse the score table
          for (int i : is) {
            System.out.print(i + "\t"); // Output the scores
if (i                 System.out.println("\nWait, " + i + "What is the score? Why did this fail? ");
                    break No1;




Loop body filter:

package com;

import java.math.BigDecimal;

import java.util.Scanner ;

public class Msj {

public static void main(String[] args) {               // Create array

            String[] array = new String[] { "Egret", " "Red-crowned crane", "oriole", "parrot", "crow", "magpie",

"Eagle", "cuckoo", "eagle", "gray bird", "eagle", "lark" } ;

System.out.println("There are many birds in my garden, but a few eagles have come recently. Please help me catch them.");

int eagleCount = 0;

for (String string : array) {// foreach traverses the array

if (string.equals("Eagle")) {//If an eagle is encountered
System.out.println("An eagle was found, Has caught in the cage. ");

Eaglecount ++;

Continue; // Interrupt loop
}
System.out.println (" Search bird, found: "+string);/// / Otherwise, output the array element
} }
  System.out.println("A total of caught: " + eagleCount + "Eagle.");
}
}

Result:

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