JAVA와 C#의 코드 비교에 대한 자세한 소개

黄舟
풀어 주다: 2017-03-03 13:41:04
원래의
1135명이 탐색했습니다.
JavaProgram StructureC#
package hello;

public class HelloWorld {
   public static void main(String[] args) {
      String name = "Java";

      // See if an argument was passed from the command line
      if (args.length == 1)
         name = args[0];

      System.out.println("Hello, " + name + "!");
    }
}
로그인 후 복사

using System;

namespace Hello {
   public class HelloWorld {
      public static void Main(string[] args) {
         string name = "C#";

         // See if an argument was passed from the command line
         if (args.Length == 1)
            name = args[0];

         Console.WriteLine("Hello, " + name + "!");
      }
   }
}
로그인 후 복사

JavaCommentsC#
// Single line
/* Multiple
    line  */
/** Javadoc documentation comments */
로그인 후 복사

// Single line
/* Multiple
    line  */
/// XML comments on a single line
/** XML comments on multiple lines */
로그인 후 복사

JavaData TypesC#


Primitive Types
boolean
byte
char
short, int, long
float, double

Reference Types
Object   (superclass of all other classes)
String
arrays, classes, interfaces
Conversions
// int to String
int x = 123;
String y = Integer.toString(x);  // y is "123"
// String to int
y = "456"; 
x = Integer.parseInt(y);   // x is 456
// double to int
double z = 3.5;
x = (int) z;   // x is 3  (truncates decimal)
로그인 후 복사




Value Types
bool
byte, sbyte
char
short, ushort, int, uint, long, ulong
float, double, decimal
structures, enumerations
Reference Types
object    (superclass of all other classes)
string
arrays, classes, interfaces, delegates
Convertions
// int to string
int x = 123;
String y = x.ToString();  // y is "123"
// string to int
y = "456";
x = int.Parse(y);   // or x = Convert.ToInt32(y);
// double to int
double z = 3.5;
x = (int) z;   // x is 3  (truncates decimal)
로그인 후 복사



JavaConstantsC#
// May be initialized in a constructor 
final double PI = 3.14;
로그인 후 복사

const double PI = 3.14;
// Can be set to a const or a variable. May be initialized in a constructor. 
readonly int MAX_HEIGHT = 9;
로그인 후 복사

JavaEnumerationsC#


enum Action {Start, Stop, Rewind, Forward};
// Special type of class 
enum Status {
  Flunk(50), Pass(70), Excel(90);
  private final int value;
  Status(int value) { this.value = value; }
  public int value() { return value; } 
};
Action a = Action.Stop;
if (a != Action.Start)
  System.out.println(a);               // Prints "Stop"

Status s = Status.Pass;
System.out.println(s.value());      // Prints "70"
로그인 후 복사




enum Action {Start, Stop, Rewind, Forward};
enum Status {Flunk = 50, Pass = 70, Excel = 90};
No equivalent.





Action a = Action.Stop;
if (a != Action.Start)
  Console.WriteLine(a);             // Prints "Stop"
Status s = Status.Pass;
Console.WriteLine((int) s);       // Prints "70"
로그인 후 복사



JavaOperatorsC#


Comparison
==  <  >  <=  >=  !=
Arithmetic
+  -  *  /
%  (mod)
/   (integer pision if both operands are ints)
Math.Pow(x, y)
Assignment
=  +=  -=  *=  /=   %=   &=  |=  ^=  <<=  >>=  >>>=  ++  --
Bitwise
&  |  ^   ~  <<  >>  >>>
Logical
&&  ||  &  |   ^   !
Note: && and || perform short-circuit logical evaluations
String Concatenation
+
로그인 후 복사




Comparison
==  <  >  <=  >=  !=
Arithmetic
+  -  *  /
%  (mod)
/   (integer pision if both operands are ints)
Math.Pow(x, y)
Assignment
=  +=  -=  *=  /=   %=  &=  |=  ^=  <<=  >>=  ++  --
Bitwise
&  |  ^   ~  <<  >>
Logical
&&  ||  &  |   ^   !
Note: && and || perform short-circuit logical evaluations
String Concatenation
+
로그인 후 복사



JavaChoicesC#


greeting = age < 20 ? "What&#39;s up?" : "Hello";
if (x < y)
  System.out.println("greater");
if (x != 100) {   
  x *= 5;
  y *= 2;
}
else
  z *= 6;
int selection = 2;
switch (selection) {     // Must be byte, short, int, char, or enum
  case 1: x++;            // Falls through to next case if no break
  case 2: y++;   break;
  case 3: z++;   break;
  default: other++;
}
로그인 후 복사




greeting = age < 20 ? "What&#39;s up?" : "Hello";
if (x < y) 
  Console.WriteLine("greater");
if (x != 100) {   
  x *= 5;
  y *= 2;
}
else
  z *= 6;

string color = "red";
switch (color) {                         // Can be any predefined type
  case "red":    r++;    break;       // break is mandatory; no fall-through
  case "blue":   b++;   break;
  case "green": g++;   break;
  default: other++;     break;      // break necessary on default
}
로그인 후 복사



JavaLoopsC#


while (i < 10)
  i++;

for (i = 2; i <= 10; i += 2) 
  System.out.println(i);
do 
  i++; 
while (i < 10);
for (int i : numArray)  // foreach construct  
  sum += i;
// for loop can be used to iterate through any Collection
import java.util.ArrayList;
ArrayList<Object> list = new ArrayList<Object>();
list.add(10);    // boxing converts to instance of Integer
list.add("Bisons");
list.add(2.3);    // boxing converts to instance of Double

for (Object o : list)
  System.out.println(o);
로그인 후 복사




while (i < 10)
  i++;

for (i = 2; i <= 10; i += 2)
  Console.WriteLine(i);
do 
  i++; 
while (i < 10);
foreach (int i in numArray)  
  sum += i;
// foreach can be used to iterate through any collection 
using System.Collections;
ArrayList list = new ArrayList();
list.Add(10);
list.Add("Bisons");
list.Add(2.3);

foreach (Object o in list)
  Console.WriteLine(o);
로그인 후 복사



JavaArraysC#
int nums[] = {1, 2, 3};   or   int[] nums = {1, 2, 3};
for (int i = 0; i < nums.length; i++)
  System.out.println(nums[i]);

String names[] = new String[5];
names[0] = "David";

float twoD[][] = new float[rows][cols];
twoD[2][0] = 4.5;
int[][] jagged = new int[5][];
jagged[0] = new int[5];
jagged[1] = new int[2];
jagged[2] = new int[3];
jagged[0][4] = 5;
로그인 후 복사

int[] nums = {1, 2, 3};
for (int i = 0; i < nums.Length; i++)
  Console.WriteLine(nums[i]);

string[] names = new string[5];
names[0] = "David";

float[,] twoD = new float[rows, cols];
twoD[2,0] = 4.5f;
int[][] jagged = new int[3][] {
    new int[5], new int[2], new int[3] };
jagged[0][4] = 5;
로그인 후 복사

JavaFunctionsC#
// Return single value int Add(int x, int y) { return x + y; } int sum = Add(2, 3);// Return no value void PrintSum(int x, int y) { System.out.println(x + y); } PrintSum(2, 3);


// Primitive types and references are always passed by value
void TestFunc(int x, Point p) {
   x++;
   p.x++;       // Modifying property of the object
   p = null;    // Remove local reference to object
}
class Point {
   public int x, y;
}
Point p = new Point(); 
p.x = 2; 
int a = 1; 
TestFunc(a, p);
System.out.println(a + " " + p.x + " " + (p == null) );  // 1 3 false 




// Accept variable number of arguments
int Sum(int ... nums) {
  int sum = 0;
  for (int i : nums)
    sum += i;
  return sum;
}
int total = Sum(4, 3, 2, 1);   // returns 10
로그인 후 복사



// Return single value int Add(int x, int y) { return x + y; } int sum = Add(2, 3);// Return no value void PrintSum(int x, int y) { Console.WriteLine(x + y); } PrintSum(2, 3);


// Pass by value (default), in/out-reference (ref), and out-reference (out)
void TestFunc(int x, ref int y, out int z, Point p1, ref Point p2) {
   x++;  y++;  z = 5;
   p1.x++;       // Modifying property of the object     
   p1 = null;    // Remove local reference to object
   p2 = null;   // Free the object
}
class Point {
   public int x, y;
}
Point p1 = new Point();
Point p2 = new Point();
p1.x = 2;
int a = 1, b = 1, c;   // Output param doesn&#39;t need initializing
TestFunc(a, ref b, out c, p1, refp2);
Console.WriteLine("{0} {1} {2} {3} {4}",
   a, b, c, p1.x, p2 == null);   // 1 2 5 3 True
// Accept variable number of arguments
int Sum(params int[] nums) {
  int sum = 0;
  foreach (int i in nums)
    sum += i;
  return sum;
}
int total = Sum(4, 3, 2, 1);   // returns 10
로그인 후 복사



JavaStringsC#


// String concatenation
String school = "Harding ";
school = school + "University";   // school is "Harding University"
// String comparison
String mascot = "Bisons";
if (mascot == "Bisons")    // Not the correct way to do string comparisons
if (mascot.equals("Bisons"))   // true
if (mascot.equalsIgnoreCase("BISONS"))   // true
if (mascot.compareTo("Bisons") == 0)   // true
System.out.println(mascot.substring(2, 5));   // Prints "son"
// My birthday: Oct 12, 1973
java.util.Calendar c = new java.util.GregorianCalendar(1973, 10, 12);
String s = String.format("My birthday: %1$tb %1$te, %1$tY", c);
// Mutable string
StringBuffer buffer = new StringBuffer("two ");
buffer.append("three ");
buffer.insert(0, "one ");
buffer.replace(4, 7, "TWO");
System.out.println(buffer);     // Prints "one TWO three"
로그인 후 복사




// String concatenation
string school = "Harding ";
school = school + "University";   // school is "Harding University"
// String comparison
string mascot = "Bisons";
if (mascot == "Bisons")    // true
if (mascot.Equals("Bisons"))   // true
if (mascot.ToUpper().Equals("BISONS"))  // true
if (mascot.CompareTo("Bisons") == 0)    // true
Console.WriteLine(mascot.Substring(2, 3));    // Prints "son"
// My birthday: Oct 12, 1973
DateTime dt = new DateTime(1973, 10, 12);
string s = "My birthday: " + dt.ToString("MMM dd, yyyy");
// Mutable string
System.Text.StringBuilder buffer = new System.Text.StringBuilder("two ");
buffer.Append("three ");
buffer.Insert(0, "one ");
buffer.Replace("two", "TWO");
Console.WriteLine(buffer);     // Prints "one TWO three"
로그인 후 복사



JavaException HandlingC#


// Must be in a method that is declared to throw this exception
Exception ex = new Exception("Something is really wrong.");
throw ex;  
try {
  y = 0;
  x = 10 / y;
} catch (Exception ex) {
  System.out.println(ex.getMessage()); 
} finally {
  // Code that always gets executed
}
로그인 후 복사




Exception up = new Exception("Something is really wrong.");
throw up;  // ha ha

try {
  y = 0;
  x = 10 / y;
} catch (Exception ex) {      // Variable "ex" is optional
  Console.WriteLine(ex.Message);
} finally {
  // Code that always gets executed
}
로그인 후 복사



JavaNamespacesC#


package harding.compsci.graphics;












// Import single class
import harding.compsci.graphics.Rectangle;
// Import all classes
import harding.compsci.graphics.*;
로그인 후 복사




namespace Harding.Compsci.Graphics {
  ...
}
or
namespace Harding {
  namespace Compsci {
    namespace Graphics {
      ...
    }
  }
}
// Import single class
using Rectangle = Harding.CompSci.Graphics.Rectangle;
// Import all class
using Harding.Compsci.Graphics;
로그인 후 복사



JavaClasses / InterfacesC#


Accessibility keywords 
public
private
protected
static


// Inheritance
class FootballGame extends Competition {
  ...
}
// Interface definition
interface IAlarmClock {
  ...
}
// Extending an interface 
interface IAlarmClock extends IClock {
  ...
}
// Interface implementation
class WristWatch implements IAlarmClock, ITimer {
   ...
}
로그인 후 복사




Accessibility keywords 
public
private
internal
protected
protected internal
static
// Inheritance
class FootballGame : Competition {
  ...
}
// Interface definition
interface IAlarmClock {
  ...
}
// Extending an interface 
interface IAlarmClock : IClock {
  ...
}
// Interface implementation
class WristWatch : IAlarmClock, ITimer {
   ...
}
로그인 후 복사



JavaConstructors / DestructorsC#


class SuperHero {
  private int mPowerLevel;
  public SuperHero() {
    mPowerLevel = 0;
  }
  public SuperHero(int powerLevel) {
    this.mPowerLevel= powerLevel;
  }
  // No destructors, just override the finalize method
  protected void finalize() throws Throwable { 
    super.finalize();   // Always call parent&#39;s finalizer  
  }
}
로그인 후 복사




class SuperHero {
  private int mPowerLevel;

  public SuperHero() {
     mPowerLevel = 0;
  }

  public SuperHero(int powerLevel) {
    this.mPowerLevel= powerLevel; 
  }

  ~SuperHero() {
    // Destructor code to free unmanaged resources.
    // Implicitly creates a Finalize method.
  }
}
로그인 후 복사



JavaObjectsC#


SuperHero hero = new SuperHero();
hero.setName("SpamMan"); 
hero.setPowerLevel(3); 

hero.Defend("Laura Jones");
SuperHero.Rest();  // Calling static method
SuperHero hero2 = hero;   // Both refer to same object 
hero2.setName("WormWoman"); 
System.out.println(hero.getName());  // Prints WormWoman 

hero = null;   // Free the object
if (hero == null)
  hero = new SuperHero();
Object obj = new SuperHero(); 
System.out.println("object&#39;s type: " + obj.getClass().toString()); 
if (obj instanceof SuperHero) 
  System.out.println("Is a SuperHero object.");
로그인 후 복사




SuperHero hero = new SuperHero(); 

hero.Name = "SpamMan"; 
hero.PowerLevel = 3;
hero.Defend("Laura Jones");
SuperHero.Rest();   // Calling static method
SuperHero hero2 = hero;   // Both refer to same object 
hero2.Name = "WormWoman"; 
Console.WriteLine(hero.Name);   // Prints WormWoman
hero = null ;   // Free the object
if (hero == null)
  hero = new SuperHero();
Object obj = new SuperHero(); 
Console.WriteLine("object&#39;s type: " + obj.GetType().ToString()); 
if (obj is SuperHero) 
  Console.WriteLine("Is a SuperHero object.");
로그인 후 복사



JavaPropertiesC#


private int mSize;
public int getSize() { return mSize; }
public void setSize(int value) {
  if (value < 0)
    mSize = 0;
  else
    mSize = value;
}

int s = shoe.getSize();
shoe.setSize(s+1);
로그인 후 복사




private int mSize;
public int Size {
  get { return mSize; }
  set {
    if (value < 0)
      mSize = 0;
    else
      mSize = value;
  }
}
shoe.Size++;
로그인 후 복사



JavaStructsC#


No structs in Java.

struct StudentRecord {
  public string name;
  public float gpa;

  public StudentRecord(string name, float gpa) {
    this.name = name;
    this.gpa = gpa;
  }
}

StudentRecord stu = new StudentRecord("Bob", 3.5f);
StudentRecord stu2 = stu;  

stu2.name = "Sue";
Console.WriteLine(stu.name);    // Prints "Bob"
Console.WriteLine(stu2.name);   // Prints "Sue"
로그인 후 복사

JavaConsole I/OC#
java.io.DataInput in = new java.io.DataInputStream(System.in);
System.out.print("What is your name? ");
String name = in.readLine();
System.out.print("How old are you? ");
int age = Integer.parseInt(in.readLine());
System.out.println(name + " is " + age + " years old.");

int c = System.in.read();   // Read single char
System.out.println(c);      // Prints 65 if user enters "A"
// The studio costs $499.00 for 3 months.
System.out.printf("The %s costs $%.2f for %d months.%n", "studio", 499.0, 3);
// Today is 06/25/04
System.out.printf("Today is %tD\n", new java.util.Date());
로그인 후 복사

Console.Write("What&#39;s your name? ");
string name = Console.ReadLine();
Console.Write("How old are you? ");
int age = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("{0} is {1} years old.", name, age);
// or
Console.WriteLine(name + " is " + age + " years old.");
int c = Console.Read();  // Read single char
Console.WriteLine(c);    // Prints 65 if user enters "A"
// The studio costs $499.00 for 3 months.
Console.WriteLine("The {0} costs {1:C} for {2} months.\n", "studio", 499.0, 3);
// Today is 06/25/2004
Console.WriteLine("Today is " + DateTime.Now.ToShortDateString());
로그인 후 복사

JavaFile I/OC#


import java.io.*;
// Character stream writing
FileWriter writer = new FileWriter("c:\\myfile.txt");
writer.write("Out to file.\n");
writer.close();
// Character stream reading
FileReader reader = new FileReader("c:\\myfile.txt");
BufferedReader br = new BufferedReader(reader);
String line = br.readLine(); 
while (line != null) {
  System.out.println(line); 
  line = br.readLine(); 
} 
reader.close();
// Binary stream writing
FileOutputStream out = new FileOutputStream("c:\\myfile.dat");
out.write("Text data".getBytes());
out.write(123);
out.close();
// Binary stream reading
FileInputStream in = new FileInputStream("c:\\myfile.dat");
byte buff[] = new byte[9];
in.read(buff, 0, 9);   // Read first 9 bytes into buff
String s = new String(buff);
int num = in.read();   // Next is 123
in.close();
로그인 후 복사




using System.IO;
// Character stream writing
StreamWriter writer = File.CreateText("c:\\myfile.txt");
writer.WriteLine("Out to file.");
writer.Close();
// Character stream reading
StreamReader reader = File.OpenText("c:\\myfile.txt");
string line = reader.ReadLine();
while (line != null) {
  Console.WriteLine(line);
  line = reader.ReadLine();
}
reader.Close();

// Binary stream writing
BinaryWriter out = new BinaryWriter(File.OpenWrite("c:\\myfile.dat")); 
out.Write("Text data"); 
out.Write(123); 
out.Close();
// Binary stream reading
BinaryReader in = new BinaryReader(File.OpenRead("c:\\myfile.dat")); 
string s = in.ReadString(); 
int num = in.ReadInt32(); 
in.Close();
로그인 후 복사



 以上就是JAVA与C#比较的代码详细介绍的内容,更多相关内容请关注PHP中文网(www.php.cn)!


관련 라벨:
원천:php.cn
본 웹사이트의 성명
본 글의 내용은 네티즌들의 자발적인 기여로 작성되었으며, 저작권은 원저작자에게 있습니다. 본 사이트는 이에 상응하는 법적 책임을 지지 않습니다. 표절이나 침해가 의심되는 콘텐츠를 발견한 경우 admin@php.cn으로 문의하세요.
인기 튜토리얼
더>
최신 다운로드
더>
웹 효과
웹사이트 소스 코드
웹사이트 자료
프론트엔드 템플릿