Java Syntax


  1. Class & Object
  2. Data Types
  3. If Loop
  4. For Loop
  5. While & do-while
  6. Switch case
  7. Constructor

1.Class & Objact

ClassName.java

 
 public class ClassName {   
  // Access_Specifier ReturnType MethodName   
  public void methodName() {   
  // Statement   
  }   
  }   
  class MainClassName {   
  public static void main(String args[]) {   
  ClassName objectName = new ClassName();   
  objectName.methodName();   
  }   
  }

2.Data Types

ClassName.java

 
  int intVal;   
  float floatVal;   
  double doubleVal;   
  boolean booleanVal;   
  char charVal;   
  String StrVal;   
  int[] intArray = new int[10];   
  float[] floatArray = new float[10];   
  double[] doubleArray = new double[10];   
  boolean[] booleanArray = new boolean[10];   
  char[] charArray = new char[10];   
  String[] StrArray = new String[10];

3.if loop

ClassName.java

 
  if(val1 condition_check val2) {  
     // Statement  
   }  


 if(val1 condition_check val2) {  
  // Statement  
  }  
  else {  
  // Statement  
  }   


 if(val1 condition_check val2) {  
  // Statement  
  }  
  else if (val3 condition_check val4) {  
  // Statement  
  } 

 if(val1 condition_check val2) {  
  // Statement  
  }  
  if(val3 condition_check val4) {  
  // Statement  
  }  
  if(val5 condition_check val6) {  
  // Statement  
  }

4.for Loop

ClassName.java
  for(initialize; condition_check; increment/ decrement) {   
  // Statement   
  } 
 
 
 for(int i=0; i<n; i++) {  
  // Statement  
  }

5.While & do-while 

ClassName.java

 
 while(condition_check) {  
     // Statement  
   }

 
  while(i < n) {  
  // Statement  
  }

 
  do {  
  // Statement  
  } while (condition_check);

 
 do {  
  // Statement  
  } while (i < n);
  
6.switch case
 
ClassName.java

 
 switch(caseValue) {  
  case caseValue1 :  
   // Statement-1 if caseValue1 = caseValue  
   break;  
  case caseValue2 :  
   // Statement-2 if caseValue2 = caseValue  
   break;  
  case caseValue3 :  
   // Statement-3 if caseValue3 = caseValue  
   break;  
  default :  
   // Statement-4 if caseValue is not available..  
  }

7.constructor

ClassName.java 

 
  public class ClassName {  
   ClassName() {  
     // Statement  
   }  
 }  
 class MainClassName {  
   public static void main(String args[]) {  
     new ClassName();  
   }  
 } 








































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