Compile issues

[oppiet30]

[oppie@dell StockMarketSimulator]$ javac StockMarketSimulatorGUI.java
StockMarketSimulatorGUI.java:134: error: local variables referenced from a lambda expression must be final or effectively final
double price = stockPrices[i];
^
StockMarketSimulatorGUI.java:135: error: local variables referenced from a lambda expression must be final or effectively final
currentUser.buyStock(stockSymbols[i], price);
^
StockMarketSimulatorGUI.java:136: error: local variables referenced from a lambda expression must be final or effectively final
JOptionPane.showMessageDialog(frame, "You've bought 1 share of " + stockSymbols[i]);
^
StockMarketSimulatorGUI.java:141: error: local variables referenced from a lambda expression must be final or effectively final
double price = stockPrices[i];
^
StockMarketSimulatorGUI.java:142: error: local variables referenced from a lambda expression must be final or effectively final
currentUser.sellStock(stockSymbols[i], price);
^
StockMarketSimulatorGUI.java:143: error: local variables referenced from a lambda expression must be final or effectively final
JOptionPane.showMessageDialog(frame, "You've sold 1 share of " + stockSymbols[i]);
^
6 errors
[oppie@dell StockMarketSimulator]$