A StringBuilder declaration as a global variable
public class Test {
public static StringBuilder sb1=new StringBuilder("Hello");
public static void main(String args[]){}
}
I'm using Intellij IDE. After declaration if I try to use
public class Test {
public static StringBuilder sb1=new StringBuilder("Hello");
sb1.append(" world!");
public static void main(String args[]){}
}
IDE suggests. append() is not available. Appending inside a method or at declaration level it works. Whereas appending after declaration is not working
public class Test {
public static StringBuilder sb1=new StringBuilder("Hello").append(" World!");
public static void main(String args[]){}
}
Just wanted to know why it is not working after declaration at global level. Can anyone help me with this
Basically you should have a public classes with inherited methods and variables. You can use the StringBuilder constructor in your main method, in which the code execution occurs and print the result.
public class Test {
public static void main(String args[]){
StringBuilder sb1=new StringBuilder("Hello").append(" World!");
System.out.println(sb1);
}
}
Or you can implement your StringBuilder in a separate method (in this case: build()) and execute this method in your main method and print the returned value inside the System.out.println() function. The function build() (you can insert any name you want), returns a StringBuilder Object to your main method.
public class Test {
public static void main(String args[]){
System.out.println(build());
}
public static StringBuilder build(){
StringBuilder sb1=new StringBuilder("Hello").append(" World!");
return sb1;
} }
Third option: You use the StringBuilder constructor in a static block:
public class Test {
static {
StringBuilder sb1=new StringBuilder("Hello").append(" World!");
System.out.println(sb1);
}
public static void main(String args[]){
}
}