The Java izjava if koristi se za testiranje stanja. Provjerava Booleov stanje: pravi ili lažno . U Javi postoje različite vrste naredbi if.

• izjava if
• izjava if-else
• ako-drugo-ako ljestve
• ugniježđena izjava if

Java if izjava

Java if naredba testira uvjet. Izvršava ako blok ako je uvjet istinit.

Sintaksa:

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

Primjer:

 //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'); } } } 

Izlaz:

Age is greater than 18 

Java if-else izjava

Java if-else izjava također testira uvjet. Izvršava ako blok ako je uvjet istinit inače inače blok se izvršava.

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Sintaksa:

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

Primjer:

 //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'); } } } 

Izlaz:

odd number 

Primjer prijestupne godine:

Godina je prijestupna ako je djeljiva sa 4 i 400. Ali ne sa 100.

 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'); } } } 

Izlaz:

LEAP YEAR 

Korištenje ternarnog operatora

Također možemo koristiti ternarni operator (? :) za izvođenje zadatka naredbe if...else. To je skraćeni način provjere stanja. Ako je uvjet istinit, rezultat ? se vraća. Ali, ako je uvjet lažan, vraća se rezultat :.

Primjer:

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 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); } } 

Izlaz:

odd number 

Java if-else-if naredba ljestvice

Iskaz ljestvice if-else-if izvršava jedan uvjet iz više naredbi.

Sintaksa:

 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 } 

Primjer:

 //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 za provjeru POZITIVNOG, NEGATIVNOG ili NULA:

 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 naredba

Ugniježđena izjava if predstavlja if blok unutar drugog if bloka . Ovdje se unutarnji if blok uvjet izvršava samo kada je vanjski if blok uvjet istinit.

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Sintaksa:

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

Primjer:

 //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'); } } }} 

Izlaz:

You are eligible to donate blood 

Primjer 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'); } } } 

Izlaz:

 You are not eligible to donate blood