How to generate a variable-name from a string

I want to name some variables automaticly. The names are read from an ArrayList and converted to string.
I tried it this way, but I failed.
for(int m=0; m<tags.size(); m++){
     System.out.println("javax.swing.JRadioButton "+tags.get(m).toString().toLowerCase()+"RadioButton;");
     String temp = tags.get(m).toString().toLowerCase().concat("RadioButton");
     javax.swing.JRadioButton temp.toString() = new JRadioButton();
     buttonList.add(m, temp.toString());
Can anyone help me, please?!

Because of the Exception I printed the content of temp and of hsh.get(temp) and both are not null:
temp: authorRadioButton
hsh.get(temp)): javax.swing.JRadioButton[,0,0,0x0,invalid,layout=javax.swing.OverlayLayout,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@7dd60e50,flags=1184,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=2,bottom=2,right=2],paintBorder=false,paintFocus=true,pressedIcon=,rolloverEnabled=false,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=]
So I really don't know why this Exception occurs when trying to use the hsh.get(temp)-method.

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