1-Hierarchical inheritance2-Variable and immutable concepts3-string3.1-string is a very special class3.2-string literals vs. String objectsMethods of 3.3-string3.3.1-length ()3.3.2-concat (String)3.3.3-indexof (..)3.3.4-substring (..)3.3.5-replace3.3
Java is very attractive, but for beginners who have just entered the Java threshold, compiling and running a very simple Java program is simply a nightmare. Clearly, the program is correct, but all kinds of confusing error messages really make you
From http://www.programbbs.com/doc/437.htm
Java is very attractive, but for beginners who have just entered the Java threshold, compile and run a very simple Java programIt's a nightmare. Mingming ProgramNoWrong, but a variety of confusing error
Screen appears:Exception in thread "main" Java.lang.noclassdeffounderror:c:/javatest/hello
Hello.class clearly in why say class is not, the reason in Classpath does not point to the class path.
1. SET classpath= 、、、、
2, Java-classpath c:/、、、
The JDK
Concatenation of stringsString strings are immutable strings, but they can also be spliced, just to create a new object. String string concatenation can use the "+" operator or the concat (string str) method of String. The advantage of the "+"
first, the String classString class in the Java.lang package, Java uses the string class to create a string variable that is part of the object. Java does not have a class for the final class that declares the string class. A string class object
In Java, the string class contains more than 50 methods to implement various operations of a string. A string variable must be initialized before it can be used, and if the declaration is assigned a value of NULL, the value of the declared string is
First, the String classString class in the Java.lang package, Java uses the string class to create a string variable that is part of the object. Java does not have a class for the final class that declares the string class. A string class object
I. Common ways to createString s1= "ABC";String s2= "ABC";S1==s2 ==> TrueParse: S1 and S2 point to the same string pool addressTwo. How to create infrequentlyString s1=New string ("abc");String s2=new string ("abc");;S1==s2 ==> falseParsing: S1
Basic overview of the String class
1, API
Java.lang//No guide pack
Public final class String
string classes represent strings. All string literals In a Java program, such as "ABC", are implemented as instances of this class.
That is, "ABC" is an
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