代码拾珍

1.废弃一个方法

@Deprecated
public final int getAssignedRoleCount() {
throw new UnsupportedOperationException("已不支持该方法。");
}

key:
a) @Deprecated
b)throw new UnsupportedoperationException

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内部static类可以new


public class test {

private static class A{
public int a;
}

public static void main(String[] arg){
A a1=new A();
A a2=new A();

a1.a=1;
a2.a=2;

System.out.println(a1.a+" "+a2.a);
}
}

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java 在处理文件目录时，有分格符

File.separator