The method of JAVA process Control
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JAVA input / output input / output
Two input methods:
Method 1: java.util.Scanner
The code is as follows:
Public class a {public static void main (String [] args) {var sc = new Scanner (System.in); System.out.println ("Please enter your name:"); String name = sc.nextLine (); System.out.printf ("% n Welcome to:% s", name);}}
Generate Scanner object, output "Please enter name:", return the input string and assign it to name, output "% n Welcome you% s" where% n means newline% s represents name
Results:
Method 2: JOptionPane input content is determined on the string value, as long as it is not determined is null
Public class a {public static void main (String [] args) {String w = JOptionPane.showInputDialog ("Please enter words:"); System.out.println (w);}}
Results:
Output
Three methods of output in the console
Method 1: System.out.print (); output to the console
Method 2: System.out.println (); output to the console and wrap
Method 3: System.out.printf (); format the output to the console
Code demonstration:
The first is direct output without line wrapping.
Public class a {public static void main (String [] args) {int w = 1; int a = 2; System.out.print (w); System.out.print (a);}}
Results:
The second kind of newline output
Public class a {public static void main (String [] args) {int w = 1; int a = 2; System.out.println (w); System.out.println (a);}}
Results:
The third formatted output
D means a variable of type int, which means to replace the value of w with the value of the first% d _ an and the second% d
Public class a {public static void main (String [] args) {int w = 1; int a = 2; System.out.printf ("wicked% d asides% d", w, a);}}
Results:
Branch statement if else
If () returns true as long as the condition in parentheses is correct, and false if it is wrong.
Whether or not else means
Public class a {public static void main (String [] args) {if (1 > 2) {System.out.println ("A");} else {System.out.println ("B");}
Multiple judgments are as follows: if the first judgment is incorrect, proceed to the next judgment, and execute it when the return value is true, otherwise execute else.
Public class a {public static void main (String [] args) {if (1 > 2) {System.out.println ("A");} else if (1 > 0) {System.out.println ("B");} else {System.out.println ("C");}} switch case default
Switch multi-branch switch statement
The parenthesis w in switch (w) is the judgment parameter, and the number after case is the value that matches w. When the value of w matches the value after case, the statement in the current case is executed
Break means to withdraw from the current judgment, which means that there is no need for judgment after it ends directly.
Default means the default value, which is defaulted when there is no match.
Public class a {public static void main (String [] args) {int wrought 1; String wk = ""; switch (w) {case 2: wk = "Monday"; break; case 3: wk = "Tuesday"; break Case 4: wk = "Wednesday"; break; case 5: wk = "Thursday"; break; case 6: wk = "Friday"; break; case 7: wk = "Saturday" Break; default: wk = "Sunday"; break;} System.out.println (wk);}}
Results:
Circular statement for
For (int iTunes 0; I < 5; iTunes +) is divided into three parts. Int iTunes 0 is the initial value, and exits the loop at i5.
Public class a {public static void main (String [] args) {for (int I = 0; I < 5; iTunes +) {System.out.println (I);}
Results:
For in
For in is mainly used to loop collections or arrays, using arrays to demonstrate
Public class a {public static void main (String [] args) {int [] a = {1,2,3,4,5}; for (int I: a) {System.out.println (I);}
I corresponds to the values in the following table of the array a, which is equivalent to the values of cyclic outputs a [0], a [1] a [2], a [3] a [4].
While do while
While (condition) {}
The condition is met to execute the statement, but the exit is not satisfied.
Public class a {public static void main (String [] args) {int I = 0; while (I < 5) {System.out.println (I);}
Results:
Do while
Unlike while, do while executes once before judging
Public class a {public static void main (String [] args) {int I = 0; do {ionization; System.out.println (I);} while (I < 0);}}
Here, execute the output first, and then judge. So condition I 10) break;}
When I is divisible by 2, skip this time and proceed to the next loop. When I is greater than 10, the cycle ends.
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