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HashMap<String,String> props=new HashMap<String,String>();
props.put("Key45","value45");
props.put("Key24","value24");
props.put("Key33","value33");
Set s=props.keySet();
s=new SortedSet(s);

Main.java:1: error: class, interface, or enum expected
HashMap<String,String> props=new HashMap<String,String>();
^
Main.java:2: error: class, interface, or enum expected
props.put("Key45","value45");
^
Main.java:3: error: class, interface, or enum expected
props.put("Key24","value24");
^
Main.java:4: error: class, interface, or enum expected
props.put("Key33","value33");
^
Main.java:5: error: class, interface, or enum expected
Set s=props.keySet();
^
Main.java:6: error: class, interface, or enum expected
s=new SortedSet(s);
^
6 errors

Standard output is empty