stringcopymodify.java

java的书上例子

//例7.4
class StringCopyModify{
		public static void main(String args[]){
		       String s = new String("Now we will show how to have a sub string.");
		       System.out.println("From String \"" + s + "\"");
		       System.out.println("the length of s is:"+s.length());
		       String sub1 = s.substring(20);
		       String sub2 = s.substring(0,20);
		       System.out.println("	get a sub string from index 19 to the end:" + sub1);
			System.out.println("the length of sub1 is:"+sub1.length());
			System.out.println("	get a sub string from index 0 to 19:" + sub2);
			System.out.println("the length of sub2 is:"+sub2.length());
			String cons = sub2.concat(sub1);
			System.out.println("	concat two sub strings into one:"+cons);
		}
}