package linhui1;
public class P3 { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String s1 = "welcome to java";
String s2=s1;
String s3=new String("welcome to java");
String s4=s3.intern();
System.out.println(s1==s2);//1
System.out.println(s1==s3);//2
System.out.println(s1.equals(s2));//3
System.out.println(s2.equals(s3));//4
System.out.println(s1.compareTo(s2));//5
System.out.println(s2.compareTo(s3));//6
System.out.println(s1==s4);//7
System.out.println(s1.charAt(0));//8
System.out.println(s1.indexOf('j'));//9
System.out.println(s1.indexOf("to"));//10
System.out.println(s1.lastIndexOf('a'));//11
System.out.println(s1.lastIndexOf("o",15));//12
System.out.println(s1.length());//13
System.out.println(s1.substring(5));//14
System.out.println(s1.substring(5,11));//15
System.out.println(s1.startsWith("welc"));//16
System.out.println(s1.endsWith("java"));//17
System.out.println("welcome".trim());//18
System.out.println(s1.toLowerCase());//19
System.out.println(s1.toUpperCase());//20
System.out.println(s1.replace('o','T'));//21
System.out.println(s1.replaceFirst("o", "T"));//22
System.out.println(s1.replaceAll("o","T"));//23
System.out.println(s1.toCharArray());
}}
true //1
false //2
true //3
true //4
0 //5
0 //6
true //7
w //8
1 //9
8 //10
14 //11
9 //12
15 //13
me to java //14
me to //15
true //16
true //17
welcome //18
welcome to java //19
WELCOME TO JAVA //20
welcTme tT java //21
welcTme to java //22
welcTme tT java //23
welcome to java //24
public class P3 { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String s1 = "welcome to java";
String s2=s1;
String s3=new String("welcome to java");
String s4=s3.intern();
System.out.println(s1==s2);//1
System.out.println(s1==s3);//2
System.out.println(s1.equals(s2));//3
System.out.println(s2.equals(s3));//4
System.out.println(s1.compareTo(s2));//5
System.out.println(s2.compareTo(s3));//6
System.out.println(s1==s4);//7
System.out.println(s1.charAt(0));//8
System.out.println(s1.indexOf('j'));//9
System.out.println(s1.indexOf("to"));//10
System.out.println(s1.lastIndexOf('a'));//11
System.out.println(s1.lastIndexOf("o",15));//12
System.out.println(s1.length());//13
System.out.println(s1.substring(5));//14
System.out.println(s1.substring(5,11));//15
System.out.println(s1.startsWith("welc"));//16
System.out.println(s1.endsWith("java"));//17
System.out.println("welcome".trim());//18
System.out.println(s1.toLowerCase());//19
System.out.println(s1.toUpperCase());//20
System.out.println(s1.replace('o','T'));//21
System.out.println(s1.replaceFirst("o", "T"));//22
System.out.println(s1.replaceAll("o","T"));//23
System.out.println(s1.toCharArray());
}}
true //1
false //2
true //3
true //4
0 //5
0 //6
true //7
w //8
1 //9
8 //10
14 //11
9 //12
15 //13
me to java //14
me to //15
true //16
true //17
welcome //18
welcome to java //19
WELCOME TO JAVA //20
welcTme tT java //21
welcTme to java //22
welcTme tT java //23
welcome to java //24
解决方案 »
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