test_concat.java

public class test_concat {

    public static void main(String[] argv) {
	String s = new String("pi");
	int i = s.length();
	String t = new String("ppo");
	String u = s.concat(t);
	char c = u.charAt(i);
	assert(c == 'p');
	assert(c == 'o');
    }
}