/**

* String,StringBuffer,StringBuilder

*/

public class StringDemo {

public static void main(String[] args) {

char[] helloArray = {'r', 'u', 'n', 'o', 'o', 'b'};

String str = new String(helloArray);

System.out.println(str);

str = "Hello World!";

System.out.println(str.length());

String str1 = "test";

String str2 = "Test";

System.out.println(str1.equalsIgnoreCase(str2));

System.out.println(str1.toUpperCase().concat(str2));

StringBuffer stringBuffer = new StringBuffer("Test1");

int capacity = stringBuffer.capacity();

System.out.println(capacity);

stringBuffer.append("Hello");

stringBuffer.append("world");

stringBuffer.delete(1, 2);

capacity = stringBuffer.capacity();

System.out.println(capacity);

System.out.println(stringBuffer);

System.out.println(stringBuffer.reverse());

StringBuilder sb = new StringBuilder("Test1");

int size = sb.capacity();

System.out.println(size);

//System.exit(0);

String aa = new String("ab");

String bb = new String("ab");

String aaa = "ab";

String bbb = "ab";

System.out.println(aa.hashCode()+"/"+bb.hashCode()+"/"+aaa.hashCode()+"/"+bbb.hashCode());

if (aa == bb)

System.out.println("aa==bb");

if (aaa == bbb)

System.out.println("aaa==bbb");

if (aa.equals(bb))

System.out.println("aa equals bb");

if (aaa.equals(bbb))

System.out.println("aaa equals bbb");

}

}