java2 使用教程(第三版) 实验指导 上机实践5 字符串、时间与数字

class StringExample { public static void main(String args[]) { String s1 = new String("you are a strdent"),s2= new String("how are you"); if(s1.equals(s2)) { System.out.println("s1与s2相同"); } else { System.out.println("s1与s2不相同"); } String s3 = new String("22030219851022024"); if(s3.startsWith("220302")) { System.out.println("吉林省的身份证"); } String s4 = new String("你"), s5 = new String("我"); if(s4.compareTo(s5)>0) { System.out.println("按字典序s4大于s5"); } else { System.out.println("按字典序s4小于s5"); } int position = 0; String path = "c:\\java\\jsp\\A.java"; position = path.lastIndexOf("\\"); System.out.println("c:\\java\\jsp\\A.java中最后出现\\的位置："+position); String fileName = path.substring(position+1); System.out.println("c:\\java\\jsp\\A.java中含有的文件名："+fileName); String s6 = new String("100"),s7=new String("123.678"); int n1 = Integer.parseInt(s6); double n2 = Double.parseDouble(s7); double m=n1+n2; System.out.println(m); String s8 = String.valueOf(m); position = s8.indexOf("."); String temp = s8.substring(position+1); System.out.println("数字"+m+"有"+temp.length()+"位小数"); String s9 = new String("ABCDEF"); char a[]= s9.toCharArray(); for(int i=a.length-1;i>=0;i--) { System.out.print(" "+a[i]); } String str1 = new String("ABCABC"),str2=null,str3=null,str4=null; str2=str1.replaceAll("A","First"); str3=str1.replaceAll("B","Second"); str4=str1.replaceAll("C","Third"); System.out.println(str1); System.out.println(str2); System.out.println(str3); System.out.println(str4); System.out.println(Long.toBinaryString(12345)); System.out.println(Long.toOctalString(12345)); System.out.println(Long.toHexString(12345)); } }