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Java If-else uttalande

De Java om uttalande används för att testa tillståndet. Det kollar booleskt skick: Sann eller falsk . Det finns olika typer av if-satser i Java.

  • om uttalande
  • if-else uttalande
  • om-annat-om stege
  • kapslad if-sats

Java if Statement

Java if-satsen testar villkoret. Den utför om block om villkoret är sant.

Syntax:

 if(condition){ //code to be executed } 
if-sats i java

Exempel:

 //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'); } } } 
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Produktion:

Age is greater than 18 

Java if-else uttalande

Java if-else-satsen testar också villkoret. Den utför om block om villkoret är sant annars annat block avrättas.

Syntax:

 if(condition){ //code if condition is true }else{ //code if condition is false } 
if-else uttalande i java

Exempel:

 //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'); } } } 
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Produktion:

odd number 

Exempel på skottår:

Ett år är ett språng om det är delbart med 4 och 400. Men inte med 100.

greibach normal form
 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'); } } } 

Produktion:

LEAP YEAR 

Använder Ternary Operator

Vi kan också använda ternär operator (? :) för att utföra uppgiften if...else-sats. Det är ett kortfattat sätt att kontrollera tillståndet. Om villkoret är sant, resultatet av ? returneras. Men om villkoret är falskt returneras resultatet av :.

Exempel:

 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); } } 

Produktion:

odd number 

Java if-else-if ladder Statement

If-else-if ladder-satsen exekverar ett villkor från flera satser.

Syntax:

 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 } 
if-else-if ladder statement i java

Exempel:

 //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){>

Program för att kontrollera POSITIV, NEGATIV eller NOLL:

 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){>

Java Nested if-sats

Den kapslade if-satsen representerar om block inom ett annat om block . Här exekveras det inre om-block-villkoret endast när det yttre om-block-villkoret är sant.

Syntax:

sortera en arraylist i java
 if(condition){ //code to be executed if(condition){ //code to be executed } } 

Exempel:

 //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;); } } }} 
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Produktion:

You are eligible to donate blood 

Exempel 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&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;); } } } 
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Produktion:

 You are not eligible to donate blood