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如果还有其他嵌套,如果在Java中:

来源:图灵教育
时间:2025-02-10 14:08:33

> if语句: 若某一条件为true,则执行一系列语句。

>

image description

语法:>

if(条件){

//要执行的代码> }

program:
public class if {  
public static void main(string[] args) {  
      float a =2.2f; 
      float b =5.4f; 
        if(b>a)
         {  
          system.out.println(" b is greater than a");  
           }  
       }  
}  


output:
b is greater than a

> if-else语句: 在java中,if-else条件是一组规则或句子,如果条件是真实的,则执行一个代码块,如果条件是false,则执行另一个块。

image description

语法:> if(条件){

///代码如果条件是true

} else { 如果条件是falsee,// }

**program**:

public class ifelse {

    public static void main(string[] args) {

        int n = 3;

        if (n > 5) {
            system.out.println("the number is greater than 5.");
        } 
         else  
        {
            system.out.println("the number is 5 or less.");
        }
    }
}


output:
the number is 5 or less.

else if语句:

如果第一个条件是false,则使用其他if语句来指定新的条件。

>语法:

if(条件1){image description //如果条件1是true

,要执行的代码块 } else if(condition2){

> //如果条件1是false,条件2是true>,要执行的代码块 } else { //如果条件1为false,并且条件2为false,要执行的代码块 }

**program:**

public class greater
{
public static void main (string args[])
{
int no1 = 1000; 
        int no2 = 1000; 
        if(no1>no2)
          {
            system.out.println("no1 is greater");
          }
        else if(no2>no1)
         {
              system.out.println("no2 is greater");
         }      
        else 
           {
         system.out.println("both are equal");
           }
}
}

output:
     both are equal

如果在java中,则嵌套 在另一个if语句中,指另一个if语句。若外部条件为真,则检查并执行内部条件。

如果 *

image descriptionif(condition1){

if(condition2){

if(condition3){ //语句; }

}

}

program:

    public class nested if
    {
    public static void main(string args[])
    {
        int a = 10;
        int b = 20;

        // outer if condition
        if (a == 10) {

            // inner if condition
            if (b != 20) {
                system.out.println("geeksforgeeks");
            }

            else {
                system.out.println("gfg");
            }
        }
    }
}


任务:程序:1 爪哇

public class age
{
public static void main (string args[])
{
 int age1=25;
 int age2=21;
    if(age1<age2)
{
       system.out.println("the condition is false");
}
    else 
{
       system.out.println("the condition is true");
}
}
}

output:
 the condition is true

python

age1 = 25
age2 = 21

if age1 < age2:
    print("the condition is false")
elif age2 < age1:
    print("the condition is true")

output:
the condition is true

爪哇

program:2

public class if {  
public static void main(string[] args) {  
      float a =2.2f; 
      float b =5.4f; 
        if(b>a)
         {  
          system.out.println(" b is greater than a");  
           }  
       }  
}  

output:
b is greater than a

python

a = 2.2
      b = 5.4
if b > a:
    print("b is greater than a")

output:
  num is greater than or equal 120

爪哇

program:3

public class greater
{
public static void main (string args[])
{
int no1 = 1000; 
        int no2 = 1000; 
        if(no1>no2)
          {
        system.out.println("no1 is greater");
          }
        else if(no2>no1)
         {
           system.out.println("no2 is greater");
         }      
        else 
           {
      system.out.println("both are equal");
           }
}
}

output:
both are equal

python

no1 = 1000
no2 = 1000

if no1 > no2:
    print("no1 is greater")
elif no2 > no1:
    print("no2 is greater")
else:
    print("Both are equal")

output:
Both are equal

>参考: 参考: 参考:

https://www.javatpoint.com/java-if-else

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