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ה Java אם הצהרה משמש לבדיקת המצב. זה בודק בוליאני מַצָב: נָכוֹן אוֹ שֶׁקֶר . ישנם סוגים שונים של הצהרת if ב-Java.

• אם הצהרה
• הצהרת if-else
• אם-אחר-אם סולם
• משפט אם מקונן

Java if Statement

הצהרת Java if בודק את התנאי. זה מבצע את אם לחסום אם התנאי נכון.

תחביר:

 if(condition){ //code to be executed } 

דוגמא:

 //Java Program to demonstate the use of if statement. public class IfExample { public static void main(String[] args) { //defining an 'age' variable int age=20; //checking the age if(age>18){ System.out.print('Age is greater than 18'); } } } 

תְפוּקָה:

Age is greater than 18 

הצהרת Java if-else

ההצהרה של Java if-else גם בודקת את התנאי. זה מבצע את אם לחסום אם המצב נכון אחרת חסימה אחרת מוצא להורג.

תחביר:

 if(condition){ //code if condition is true }else{ //code if condition is false } 

דוגמא:

 //A Java Program to demonstrate the use of if-else statement. //It is a program of odd and even number. public class IfElseExample { public static void main(String[] args) { //defining a variable int number=13; //Check if the number is divisible by 2 or not if(number%2==0){ System.out.println('even number'); }else{ System.out.println('odd number'); } } } 

תְפוּקָה:

odd number 

דוגמה לשנה מעוברת:

שנה היא זינוק, אם היא מתחלקת ב-4 וב-400. אבל, לא ב-100.

מחסנית ב-ds

 public class LeapYearExample { public static void main(String[] args) { int year=2020; if(((year % 4 ==0) && (year % 100 !=0)) || (year % 400==0)){ System.out.println('LEAP YEAR'); } else{ System.out.println('COMMON YEAR'); } } } 

תְפוּקָה:

LEAP YEAR 

שימוש ב-Ternary Operator

אנחנו יכולים גם להשתמש באופרטור טרינרי (? :) כדי לבצע את המשימה של הצהרת if...else. זוהי דרך קצרה לבדוק את המצב. אם התנאי נכון, התוצאה של ? מוחזר. אבל, אם התנאי הוא שקרי, התוצאה של : מוחזרת.

דוגמא:

 public class IfElseTernaryExample { public static void main(String[] args) { int number=13; //Using ternary operator String output=(number%2==0)?'even number':'odd number'; System.out.println(output); } } 

תְפוּקָה:

odd number 

הצהרת סולם Java if-else-if

המשפט if-else-if ladder מבצע תנאי אחד ממספר משפטים.

תחביר:

 if(condition1){ //code to be executed if condition1 is true }else if(condition2){ //code to be executed if condition2 is true } else if(condition3){ //code to be executed if condition3 is true } ... else{ //code to be executed if all the conditions are false } 

דוגמא:

 //Java Program to demonstrate the use of If else-if ladder. //It is a program of grading system for fail, D grade, C grade, B grade, A grade and A+. public class IfElseIfExample { public static void main(String[] args) { int marks=65; if(marks=50 &amp;&amp; marks=60 &amp;&amp; marks=70 &amp;&amp; marks=80 &amp;&amp; marks=90 &amp;&amp; marks<100){ system.out.println('a+ grade'); }else{ system.out.println('invalid!'); } < pre> <p>Output:</p> <pre>C grade </pre> <p> <strong>Program to check POSITIVE, NEGATIVE or ZERO:</strong> </p> <pre> public class PositiveNegativeExample { public static void main(String[] args) { int number=-13; if(number&gt;0){ System.out.println(&apos;POSITIVE&apos;); }else if(number<0){ system.out.println('negative'); }else{ system.out.println('zero'); } < pre> <p>Output:</p> <pre>NEGATIVE </pre> <h2>Java Nested if statement</h2> <p>The nested if statement represents the <em>if block within another if block</em> . Here, the inner if block condition executes only when outer if block condition is true. </p> <p> <strong>Syntax:</strong> </p> <pre> if(condition){ //code to be executed if(condition){ //code to be executed } } </pre>  <p> <strong>Example:</strong> </p> <pre> //Java Program to demonstrate the use of Nested If Statement. public class JavaNestedIfExample { public static void main(String[] args) { //Creating two variables for age and weight int age=20; int weight=80; //applying condition on age and weight if(age&gt;=18){ if(weight&gt;50){ System.out.println(&apos;You are eligible to donate blood&apos;); } } }} </pre> <span> Test it Now </span> <p>Output:</p> <pre>You are eligible to donate blood </pre> <p> <strong>Example 2:</strong> </p> <pre> //Java Program to demonstrate the use of Nested If Statement. public class JavaNestedIfExample2 { public static void main(String[] args) { //Creating two variables for age and weight int age=25; int weight=48; //applying condition on age and weight if(age&gt;=18){ if(weight&gt;50){ System.out.println(&apos;You are eligible to donate blood&apos;); } else{ System.out.println(&apos;You are not eligible to donate blood&apos;); } } else{ System.out.println(&apos;Age must be greater than 18&apos;); } } } </pre> <span> Test it Now </span> <p>Output:</p> <pre> You are not eligible to donate blood </pre> <hr></0){></pre></100){>

תוכנית לסימון חיובי, שלילי או אפס:

 public class PositiveNegativeExample { public static void main(String[] args) { int number=-13; if(number&gt;0){ System.out.println(&apos;POSITIVE&apos;); }else if(number<0){ system.out.println(\'negative\'); }else{ system.out.println(\'zero\'); } < pre> <p>Output:</p> <pre>NEGATIVE </pre> <h2>Java Nested if statement</h2> <p>The nested if statement represents the <em>if block within another if block</em> . Here, the inner if block condition executes only when outer if block condition is true. </p> <p> <strong>Syntax:</strong> </p> <pre> if(condition){ //code to be executed if(condition){ //code to be executed } } </pre>  <p> <strong>Example:</strong> </p> <pre> //Java Program to demonstrate the use of Nested If Statement. public class JavaNestedIfExample { public static void main(String[] args) { //Creating two variables for age and weight int age=20; int weight=80; //applying condition on age and weight if(age&gt;=18){ if(weight&gt;50){ System.out.println(&apos;You are eligible to donate blood&apos;); } } }} </pre> <span> Test it Now </span> <p>Output:</p> <pre>You are eligible to donate blood </pre> <p> <strong>Example 2:</strong> </p> <pre> //Java Program to demonstrate the use of Nested If Statement. public class JavaNestedIfExample2 { public static void main(String[] args) { //Creating two variables for age and weight int age=25; int weight=48; //applying condition on age and weight if(age&gt;=18){ if(weight&gt;50){ System.out.println(&apos;You are eligible to donate blood&apos;); } else{ System.out.println(&apos;You are not eligible to donate blood&apos;); } } else{ System.out.println(&apos;Age must be greater than 18&apos;); } } } </pre> <span> Test it Now </span> <p>Output:</p> <pre> You are not eligible to donate blood </pre> <hr></0){>

הצהרת Java Nested if

הצהרת if המקוננת מייצגת את if block בתוך אחר if block . כאן, תנאי החסימה הפנימית מופעלת רק כאשר תנאי החסימה החיצוני נכון.

תחביר:

גיזום אלפא בטא

 if(condition){ //code to be executed if(condition){ //code to be executed } } 

דוגמא:

 //Java Program to demonstrate the use of Nested If Statement. public class JavaNestedIfExample { public static void main(String[] args) { //Creating two variables for age and weight int age=20; int weight=80; //applying condition on age and weight if(age>=18){ if(weight>50){ System.out.println('You are eligible to donate blood'); } } }} 

תְפוּקָה:

You are eligible to donate blood 

דוגמה 2:

 //Java Program to demonstrate the use of Nested If Statement. public class JavaNestedIfExample2 { public static void main(String[] args) { //Creating two variables for age and weight int age=25; int weight=48; //applying condition on age and weight if(age>=18){ if(weight>50){ System.out.println('You are eligible to donate blood'); } else{ System.out.println('You are not eligible to donate blood'); } } else{ System.out.println('Age must be greater than 18'); } } } 

תְפוּקָה:

 You are not eligible to donate blood