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class Test {
	private final int foo;
	
	public void setFoo(int bar) {
		foo = bar;
	}
	
	public Test() {
		
	}
	
	public static void main (String[] args) {
		Test qux = new Test();
		qux.setFoo(42);
		System.out.println("did it");
	}
}
Compilation error #stdin compilation error #stdout 0s 0KB
stdin
Standard input is empty
compilation info
Main.java:5: error: cannot assign a value to final variable foo
		foo = bar;
		^
1 error
stdout
Standard output is empty