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95 lines (78 loc) · 2.31 KB
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import java.io.IOException;
/*
* Try This 3-3
*
* The finished Java statement Help system that processes multiple requests.
*
* */
public class Help3 {
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
char choice, ignore;
// The program loops until the letter q is pressed.
for (;;) {
do {
// Display a menu
System.out.println("Help on:");
System.out.println(" 1. if");
System.out.println(" 2. switch");
System.out.println(" 3. for");
System.out.println(" 4. while");
System.out.println(" 5. do-while");
System.out.println(" 6. break");
System.out.println(" 7. continue\n");
System.out.print("Choose one (q to quit): ");
// Input the user's choice
choice = (char) System.in.read();
do {
ignore = (char) System.in.read();
} while (ignore != '\n');
} while (choice < '1' | choice > '7' & choice != 'q'); // Check for a valid response.
// Check for a valid response
if (choice == 'q')
break;
System.out.println("\n");
// Display information about the item selected.
switch (choice) {
case '1':
System.out.println("The if:\n");
System.out.println("if(condition) statement;");
System.out.println("else statement;");
break;
case '2':
System.out.println("The switch:\n");
System.out.println("switch(expression) {");
System.out.println(" case constant:");
System.out.println(" statement sequence");
System.out.println(" break;");
System.out.println(" // ...");
System.out.println("}");
break;
case '3':
System.out.println("The for:\n");
System.out.print("for(init; condition; iteration)");
System.out.println(" statement;");
break;
case '4':
System.out.println("The while:\n");
System.out.println("while(condition) statement;");
break;
case '5':
System.out.println("The do-while:\n");
System.out.println("do {");
System.out.println(" statement;");
System.out.println("} while (condition);");
break;
case '6':
System.out.println("The break:\n");
System.out.println("break; or break label;");
break;
case '7':
System.out.println("The continue:\n");
System.out.println("continue; or continue label;");
break;
}
System.out.println();
}
}
}