Java Programming Examples

Chinese

java

import java.util.*;
public class CPP{

     public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        int no_of_vertices=sc.nextInt();
        int no_of_edges=sc.nextInt();
        int node1, node2, cost;
        for(int i=0;i<no_of_edges;i++){
            node1=sc.nextInt();
            node2=sc.nextInt();
            cost=sc.nextInt();
        }
     }
}

Compile and Execute Java Online

java

package com.india.sachin;
import java.util.*;
import java.util.stream.*;


class Student
{
    int age;
    String name;
    int marks;
    
    
    public Student(int age,String name,int marks)
    {
        
        this.age=age;
        this.name=name;
        this.marks=marks;
        
    }
    public int getAge() {
		return age;
	}


	public void setAge(int age) {
		this.age = age;
	}


	public String getName() {
		return name;
	}


	public void setName(String name) {
		this.name = name;
	}


	public int getMarks() {
		return marks;
	}


	public void setMarks(int marks) {
		this.marks = marks;
	}
	

    
    
}

public class HelloWorld
{
    
    
    public static void main(String[] args)
    {
        
        
        ArrayList<Student> al=new ArrayList<Student>();
        
        
        al.add(new Student(27,"sachin",78));
        al.add(new Student(26,"nitin",45));
        
      /*  
        al.forEach((n)->System.out.println(n.age+" "+n.name));
        
        
        al.forEach(
            
           (m)->System.out.println(m.marks)
            
            );
      */      
            
         /*   al.stream().filter(p->p.age>26).forEach((p)->System.out.println(p.age+" "+p.name+" "+p.marks));
         */   
            
            Set<Integer> set=al.stream().filter(p->p.age>26).map(p->p.age).collect(Collectors.toSet());
            
            
        for(int a:set)
        {
       //     System.out.println(a);
        }
        
        
        Set<Student> set1=al.stream().sorted(new Comparator<Student>()
        {
            public int compare(Student s1,Student s2)
            {
                if(s1.getAge()<s2.getAge())
                {
                    return 1;
                }
                else if(s1.getAge()>s2.getAge())
                {
                    return -1;
                }
                else
                {
                    return 0;
                }
            }
        }
        
        ).collect(Collectors.toSet());
        
    
                set1.forEach((n)->System.out.println(n.age+" "+n.name+" "+n.marks));
                
    Map<Integer,String> ma=al.stream().collect(Collectors.toMap(m->m.age,m->m.name));            
                
        System.out.println(ma);        
                
    }
    
    
}

insertionSort

java

public class InsertionSorter {
    public static int sort(int[] randi) {
        if (randi == null || randi.length == 0) {
            return 0;
        }
        int count = 0;
        //int n = randi.length; 
        for (int i = 1; i < randi.length; ++i) { 
            int pivot = randi[i]; 
            int j = i - 1; 
            while (j >= 0 && randi[j] > pivot) {
                count++;
                randi[j + 1] = randi[j]; 
                j = j - 1; 
            } 
            randi[j + 1] = pivot; 
        }
        System.out.println("count: " + count);
        System.out.println();
        return count;
    }
    static void printArray(int arr[]) 
    { 
        //int n = arr.length; 
        for (int i = 0; i < arr.length; ++i) 
            System.out.print(arr[i] + " "); 
  
        System.out.println(); 
    } 
  
    // Driver method 
    public static void main(String args[]) 
    { 
        int arr[] = { 12, 11, 13, 5, 6, 8, 20 }; 
  
        InsertionSorter ob = new InsertionSorter(); 
        ob.sort(arr); 
  
        printArray(arr); 
    } 
}

Compile and Execute Java Online

java

   public class ExceptionExam3 {   
        public static void main(String[] args) {
            int i = 10;
            int j = 0;
            try{
                int k = divide(i, j);
                System.out.println(k);
            }catch(IllegalArgumentException e){
                System.out.println("0으로 나누면 안됩니다.");
            }           
        }

        public static int divide(int i, int j) throws IllegalArgumentException{
            if(j == 0){
                throw new IllegalArgumentException("0으로 나눌 수 없어요.");
            }
            int k = i / j;
            return k;
        }   
    }

box program

java

public class BoxDemo
        {
           
            public static void main(String []args)
            {
                Box b1=new Box();
                b1.height=5;
                b1.length=10;
                b1.breadth=6;
                b1.volume();
               
               
            }
           
        }
class Box
{
         int length,breadth,height;
         public void volume()
         {
             int vol;
             vol=length*height*breadth;
             System.out.println("vol of the box="+vol);
             
         }
}

Compile and Execute Java Online

java

public class HelloWorld{

     public static void main(String []args){
         int num1=70;
         int num2=70;
         int num3=70;
     
     if(num1>num2 && num1>num3){
      System.out.println(num1);
         
     }
      
     else if(num2>num1 && num2>num3){
      System.out.println(num2);
         
     }
      else if(num3>num1 && num3>num2){
      System.out.println(num3);
          
      }
      else {
      System.out.println(" the number are equal ");
          
      }
        
     }
}

Compile and Execute Java Online

java

public class HelloWorld{

     public static void main(String []args){
        System.out.println("Hello World");
     }
}

Compile and Execute Java Online

java

public class HelloWorld{

     public static void main(String []args){
        System.out.println("Hello World");
        int num1 = 10;
         int num2 = 90;
          int num3 = 100;
          if(num1>num2 && num1 > num3 ){
           System.out.println("largest number is:"+num1);  
          }
          else if(num2 > num3 && num2 > num1 ){
           System.out.println("largest number is:"+num2);
           }
          
           else if(num3 > num1 && num3 > num2){
           System.out.println("largest number is:"+num3);
           }
           else{
               System.out.println("no.are equal");
           }
     } 
}

burbuja

java


package metodo.de.la.burbuja;

public class MetodoDeLaBurbuja 
{
    public static int[] burbuja(int[] arreglo)
    {
      int auxiliar;
      int[] arregloOrdenado;
      
      for(int i = 2; i < arreglo.length; i++)
      {
         
        for(int j = 0;j < arreglo.length-i;j++)
        {
          if(arreglo[j] > arreglo[j+1])
          {
             
            auxiliar = arreglo[j];
            arreglo[j] = arreglo[j+1];
            arreglo[j+1] = auxiliar;
          }   
        }
      }
      
      arregloOrdenado = arreglo;
      return arregloOrdenado;
    }
    
    public static void main(String[] args) 
    {
     
      int arreglo[] = {8,6,7,2,1,8,6,8,7,1,9,7,7,10};
      int arregloOrdenado[] = burbuja(arreglo);
 
      
      for(int i = 0; i < arregloOrdenado.length;i++)
        System.out.println(arregloOrdenado[i]);
    }
}

Replace String in Java

java

/* 1. Replace following sentence with “Mercedes best german car” to “BMW best german car” */

public class HelloWorld {

    public static void replace(){
        String Text = "Mercedes is the best German car!";
        String change = "Mercedes"; 
        String replace = "BMW";
        System.out.println(Text.replace(change, replace));
    }

    public static void main(String []args) {
        replace();
    }
    
}

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