String 구성 방법 및 일반 방법

public class StringTest{
    public static void main(String[] args){
        //1
        String s1 = "abc";
        //2
        String s2 = new String("cdg");
        //3
        byte[] bytes={98,88,34,25};
        String s3 = new String(bytes);
        //4String(byte[] bytes, int offset, int length)Constructs a new String by decoding the specified subarray of bytes using the platform's default charse；
        String s4 = new String(bytes,1,3);
        //5.
	char[] c1 = {' ',' ',' ',' ',' '};
	String s5 = new String(c1);
	System.out.println(s5); //     
		
	//6.
	String s6 = new String(c1,2,2);
	System.out.println(s6); //  System.out.println(s3); //abcd  String     Object  toString
    }
}

/*       
*/

public class StringTest06{
	
	public static void main(String[] args){
		
		//1.char charAt(int index);
		String s1 = "    ，   ！";
		char c1 = s1.charAt(2);
		System.out.println(c1); // 
		
		//2.boolean endsWith(String endStr);
		System.out.println("HelloWorld.java".endsWith("java")); //true
		System.out.println("HelloWorld.java".endsWith(".java")); //true
		System.out.println("HelloWorld.java".endsWith("HelloWorld.java")); //true
		
		System.out.println("HelloWorld.java".endsWith("txt")); //false
		System.out.println("HelloWorld.java".endsWith("java ")); //false
		
		//3. boolean equalsIgnoreCase(String anotherString);
		System.out.println("abc".equalsIgnoreCase("ABc")); //true
		
		//4.byte[] getBytes();
		byte[] bytes = "abc".getBytes();
		
		for(int i=0;i<bytes.length;i++){
			System.out.println(bytes[i]);
		}
		
		//5.int indexOf(String str);
		System.out.println("http://192.168.1.100:8080/oa/login.action?username=jack&pwd=123".indexOf("/oa"));//25
		
		//6.int indexOf(String str, int fromIndex);
		System.out.println("javaoraclec++javavb".indexOf("java",1)); //13
		
		//7.int lastIndexOf(String str) 
		System.out.println("javaoraclec++javavb".lastIndexOf("java")); //13
		
		//8.int lastIndexOf(String str, int fromIndex) 
		System.out.println("javaoraclec++javavb".lastIndexOf("java",14)); //13
		
		//9.int length();
		System.out.println("abc".length()); //   length  ,String length()  
		
		//10. String replaceAll(String s1,String s2);
		//mysqloraclec++mysqlvb
		System.out.println("javaoraclec++javavb".replaceAll("java","mysql")); //     4    
		
		//11.String[] split(String s);
		String myTime = "2008,08,08";
		String[] ymd = myTime.split(",");
		
		for(int i=0;i<ymd.length;i++){
			System.out.println(ymd[i]);
		}
		
		//12.boolean startsWith(String s);
		System.out.println("/system/login.action".startsWith("/")); //true
		
		//13.String substring(int begin);
		System.out.println("/oa/login.action".substring(3)); //  /login.action
		
		//14. String substring(int beginIndex, int endIndex) 
		System.out.println("/oa/login.action".substring(4,9)); //login
		
		//15.char[] toCharArray();//           
		char[] c2 = "     ".toCharArray();
		for(int i=0;i<c2.length;i++){
			System.out.println(c2[i]);
		}
		
		//16.     
		System.out.println("Abcdef".toUpperCase());
		
		//17.     
		System.out.println("ABCDEf".toLowerCase());
		
		//18.String trim();、、       
		System.out.print("       a  bcd e          ".trim());
		System.out.println("TEST");
		
		//19.String valueOf(Object obj); Returns the string representation of the Object argument.
		Object o = null;
		System.out.println(o); //  ，         toString  ,String.valueOf(Object)            。
		System.out.println(String.valueOf(o));
		//System.out.println(o.toString()); //