개발새발 IT

import java.net.InetAddress;

public class dailyCode {

public static void main(String[] args) {

try{

String google = "www.google.com";

String naver = "www.naver.com";

InetAddress googleAddr = InetAddress.getByName(google);

String googleName = googleAddr.getHostName();

String googleAddress = googleAddr.getHostAddress();

System.out.println("googleAddr = " + googleAddr);

System.out.println("googleName = " + googleName + ", googleAddress = " + googleAddress);

InetAddress local = InetAddress.getLocalHost();

byte[] localAddr = local.getAddress();

System.out.println("local = " + local);

for(int i=0; i<localAddr.length; i++){

System.out.print((localAddr[i]<0?(localAddr[i]+256):localAddr[i]));

if(i < localAddr.length-1){

System.out.print(".");

}

}

}catch(Exception e) {

e.printStackTrace();

}

}

} 

interface Anonymous{

public void printName();

}

public class dailyCode {

public static void main(String[] args) {

Anonymous test = new Anonymous() {

@Override

public void printName() {

System.out.println("anonymous class");

}

};

test.printName();

Anonymous lamdaTest = ()-> System.out.println("lambda expression");

lamdaTest.printName();

}

} 

import java.util.Arrays;

import java.util.HashMap;

import java.util.Hashtable;

import java.util.Set;

public class dailyCode {

public static void main(String[] args) {

int[] arr = {1, 2, 3, 4, 5};

int[] order = {4, 1, 3, 5, 2};

Arrays.fill(arr, 0);

for(int num : arr) {

System.out.println("num : " + num);

}

System.out.println("-------");

Arrays.fill(arr, 1, 4, 8);

for(int num : arr) {

System.out.println("num : " + num);

}

System.out.println("-------");

Arrays.sort(order);

for(int num : order) {

System.out.println("num : " + num);

}

}

}