更新时间:2022-10-03 16:29:09
public class OODemo12{
public static void main(String args[]){
String str1 = "abc" ;
String str2 = new String("abc") ;
String str3 = str2 ;
}
};
|
public class OODemo12{
public static void main(String args[]){
String str1 = "abc" ;
String str2 = new String("abc") ;
String str3 = str2 ;
System.out.println(str1==str2) ; // false
System.out.println(str1==str3) ; // false
System.out.println(str3==str2) ; // true
}
};
|
public class OODemo13{
public static void main(String args[]){
String str1 = "abc" ;
String str2 = new String("abc") ;
String str3 = str2 ;
System.out.println(str1.equals(str2)) ; // true
System.out.println(str1.equals(str3)) ; // true
System.out.println(str3.equals(str2)) ; // true
}
};
|
public class OODemo14{
public static void main(String args[]){
String str1 = "abc" ;
}
};
|
public class OODemo14{
public static void main(String args[]){
String str1 = new String("abc") ;
}
};
|
public class OODemo14{
public static void main(String args[]){
String str1 = "abc" ;
str1 += "bcd" ;
System.out.println(str1) ;
}
};
|
public class OODemo15{
public static void main(String args[]){
String str1 = "abc" ;
String str2 = "abc" ;
System.out.println(str1==str2) ;
}
};
|
public class OODemo28{
public static void main(String args[]){
String str1 = "a" ;
for(int i=0;i<100;i++){
str1 += i ;
}
System.out.println(str1) ;
}
};
|
public class OODemo16{
public static void main(String args[]){
String str1 = "abcfdafdsadafsdfdssdfa" ;
System.out.println(str1.length()) ;
}
};
|
public class OODemo17{
public static void main(String args[]){
String str1 = "abcfdafdsadafsdfdssdfa" ;
char c[] = str1.toCharArray() ;
for(int i=0;i<c.length;i++){
System.out.print(c[i]+"\t") ;
}
}
};
|
public class OODemo18{
public static void main(String args[]){
char c[] = {'a','b','c','d','e'} ;
System.out.print(new String(c)) ;
}
};
|
public class OODemo19{
public static void main(String args[]){
String str = "ABCDEFG" ;
System.out.println(str.indexOf("ABC")) ;
if(str.indexOf("ABC")!=-1){
System.out.println("查到了指定内容。") ;
}else{
System.out.println("没有查到指定内容。") ;
}
}
};
|
public class OODemo20{
public static void main(String args[]){
String str = "ABCDEFG" ;
System.out.println(str.substring(0,3)) ;
}
};
|
public class OODemo21{
public static void main(String args[]){
String str = "A:B:C" ;
String s[] = str.split(":") ;
for(int i=0;i<s.length;i++){
System.out.println(s[i]) ;
}
}
};
|
public class OODemo22{
public static void main(String args[]){
String str = "hello world!!!" ;
System.out.println(str.replace("o","x")) ;
}
};
|
public class OODemo23{
public static void main(String args[]){
String str = "**hello**" ;
System.out.println(str.startsWith("**")) ;
System.out.println(str.endsWith("**")) ;
}
};
|
public class OODemo24{
public static void main(String args[]){
String str = "MIKE:70|JONES:80|TOM:75" ;
System.out.println("\"\'\\") ;
// 拆分两次
String s1[] = str.split("\\|") ;
for(int i=0;i<s1.length;i++){
String s2[] = s1[i].split(":") ;
System.out.println(s2[0]+" --> "+s2[1]) ;
}
}
};
|
public class OODemo25{
public static void main(String args[]){
String str = "helwo" ;
System.out.println(str.charAt(2)) ;
}
};
|
public class OODemo26{
public static void main(String args[]){
char c[] = {'h','e','l','w','o'} ;
System.out.println(new String(c,1,3)) ;
}
};
|
public class OODemo27{
public static void main(String args[]){
String str1 = "abc" ;
String str2 = "ABC" ;
System.out.println(str1.equalsIgnoreCase(str2)) ;
}
};
|
class Demo{
int x ;
};
public class Demo29{
public static void main(String args[]){
Demo d1 = new Demo() ;
d1.x = 30 ;
fun(d1) ;
System.out.println(d1.x) ;
}
public static void fun(Demo d2){
d2.x = 50 ;
}
};
|
public class Demo30{
public static void main(String args[]){
String str = "abc" ;
fun(str) ;
System.out.println(str) ;
}
public static void fun(String s){
s = "bcd" ;
}
};
|
class Demo{
String name ;
};
public class Demo31{
public static void main(String args[]){
Demo d = new Demo() ;
d.name = "abc" ;
fun(d) ;
System.out.println(d.name) ;
}
public static void fun(Demo x){
x.name = "bcd" ;
}
};
|