import javax.swing.*; publicclass StringTest2 { publicstaticvoid main(String args[]){ String s1,s2,s3,s4,output; s1=new String ("good morning"); s2=new String ("John"); s3=new String("How are you"); s4=new String(" how are you"); output="s1="+s1+"\ns2="+s2+"\ns3="+s3+"\ns4"+s4+"\n\n"; if(s1.equals("hello")) output+="s1 equals\"hello\"\n"; else output+="s1 dose not equal\"hello\"\n"; if (s3.equalsIgnoreCase(s4)) output+="s3 equals s4\n"; else output+="s3 dose not equal s4\n"; if(s3.regionMatches(0,s4,0,5)) output+="First 5 characters of s3 and s4 match\n"; else output+="First 5 characters of s3 and s4 do not match\n"; if(s3.regionMatches(true,0,s4,0,5)) output+="First 5 characters of s3 and s4 match\n"; else output+="First 5 characters of s3 and s4 do not match\n"; output+="s1与s4连接起来是:"+s1.concat(s4)+"\n"; output+="the first\"day\"of s4 is :"+s4.indexOf("you")+"\n"; output+="the last\"day\"of s4 is :"+s4.lastIndexOf("we"); JOptionPane.showMessageDialog(null,output,"Demonstring String Class CONstructors",JOptionPane.INFORMATION_MESSAGE); System.exit(0); } } //p133