局部变量是否允许与全局变量同名？(Local variable is allowed the same name as global variable?)

 我知道在某些情况下你可以有一个全局变量和一个具有相同名称的局部变量，例如 
 
int i = 0;

public Something(int i) {
    this.i = i;
}
 
 但是我很困惑为什么这样做。 我的代码看起来有点像这样 
 
TableRowSorter dataSorter; //Global Variable

public void setUpTable() {
    //Some Code
    dataSorter = new TableRowSorter(table.getModel());
    table.setRowSorter(dataSorter);
    DefaultRowSorter dataSorter = (DefaultRowSorter) table.getRowSorter(); //Local Variable
    //Some More Code
}
 
 为什么允许DefaultRowSorter具有与TableRowSorter相同的变量名？ 

I am aware in certain circumstances you can have a global variable and a local variable which have the same name such as
 
int i = 0;

public Something(int i) {
    this.i = i;
}
 
However I am confused to why this works. My code looks a little like this
 
TableRowSorter dataSorter; //Global Variable

public void setUpTable() {
    //Some Code
    dataSorter = new TableRowSorter(table.getModel());
    table.setRowSorter(dataSorter);
    DefaultRowSorter dataSorter = (DefaultRowSorter) table.getRowSorter(); //Local Variable
    //Some More Code
}
 
Why is the DefaultRowSorter allowed to have the same variable name as TableRowSorter does?

原文：https://stackoverflow.com/questions/38283730