How to use java loop statement

1. Jump control statement:

Distinguish between continue and break;

* continue: used in loops, based on conditional control, to skip the execution of a certain loop body content and continue The next execution;

* break: used in loops, based on conditional control, to terminate the execution of the contents of the loop body, that is to say, end the entire current loop;

Sample code:

public static void main(String[] args) {
    int i;
    for (i=1;i<=5;i++){
    	if(i%2==0){
    		//continue;
    		break;
    	}
    	System.out.println(i);
    }
 
	}

If the conditional control statement is continue, the console output result is 1,3,5, i=1. For the conditional judgment statement after if (1%2==0), the result is false and skipped The execution of the content of the loop body outputs 1 on the console; i, i=2. For the conditional judgment statement after the if result is true, the execution of system.out.println(i); is skipped, i =3....

If the conditional control statement is break, the output result on the console is 1, i=1. For the conditional judgment statement after if (1%2==0), the result is false, and then the loop body is terminated. The execution of the content only outputs a 1 on the console;

2. Loop nesting:

Overview of loop statement nesting

* Sequential statement: End with semicolon, Indicates the end of a switch;

* Branch statement: A pair of braces represents the overall structure of if, describing a complete if statement as a whole

A pair of braces represents the overall structure of Switch, as a whole Describe a complete Switch statement

* Loop statement: A pair of braces represents the overall structure of for, which describes a complete for statement

A pair of braces represents the overall structure of while, as a whole Describe a complete while statement

                                                                                                                                                                                                                                                                                            . Hours and minutes of a day

	public static void main(String[] args) {
 
		for (int hour=0;hour<24;hour++){
			for(int minute=0;minute<60;minute++){
				System.out.println(hour+"时"+minute+"分");
			}
		}
	}

3.Random

The function and usage steps of Random

Function: used to generate a random number

Usage steps:

1. Guide the package

import java.util.Random;

The action of guiding the package must appear above the class definition

2. Create the object

Random r = new Random();

In the above format, r It is the variable name and can be changed. Others are not allowed to change.

3. Obtain random numbers

int number = r.nextInt(100);   //获取随机数范围为：[0.100) ,前闭后开

In the above format, number is the variable name and can be changed. 100 is the range for obtaining random numbers. , can be changed, others are not allowed to change

Code example: Get a random number within 100 [0.100), and print it on the console

import java.util.Random;
 
public class text051 {
 
	public static void main(String[] args) {
		Random r = new Random();
		int number=r.nextInt(100);
		System.out.println(number);
 
	}
 
}

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