CODEWITHSUNDEEP
javaloopsif-statement
Amar
Amar

Reputation: 529

multiple if statements and a loop

I have a logical problem. I will provide pseudo code since the real code isn't all that readable. I want to only enter one of the instructions, and if none of the instructions are reachable I want the function to break out from the loop.

I'm pretty new to programming so any help is appreciated.

edit: In every iteration I want to only reach one of the conditions. Since there is a loop going on for a longer time I want to be able to reach the same / other instructions for every iteration

while(true){
     if(condition){ // Instruction 1
        do stuff
    }else{
        do stuff
    }
    if(condition){ // Instruction 2
        do stuff
    }else{
        do stuff
    }
    if(condition){ // Instruction 3
        do stuff
    }else{
        do stuff
    }

    if(condition){ // Instruction 4
        do stuff
    }else{
        do stuff
    }

    if(none condition){
        break;
    }
}

Upvotes: 1

Views: 14287

Answers (6)

Eritrean
Eritrean

Reputation: 16508

Alternatively you can check if it is possible to use switch Statements instead of if-else. Example 

        public static void main(String argv[]) {
          String [] conditions = {"condition_1","condition_2","condition_3","condition_4","xyz"};
          printConditionType(conditions);
        } 
        public static void printConditionType(String [] conditions){
          int i = 0;
          while (i<conditions.length){
             switch (conditions[i]) {
                 case "condition_1":
                    System.out.println("#1");
                    break;
                 case "condition_2":
                    System.out.println("#2");                    
                    break;
                 case "condition_3":
                    System.out.println("#3");                    
                    break;
                 case "condition_4":
                    System.out.println("#4");
                    break;
                 default:
                    System.out.println("Invalid condition:" + conditions[i]);
            }
            i++;
        }
    }

Upvotes: 0

Michael
Michael

Reputation: 44250

I don't think anyone's got this spot on so far so I'll throw in my understanding of what you're asking.

while(true) // keep looping
{
    boolean instructionExecuted = false; // we haven't done an instruction this iteration

    // Instruction 1
    if(condition) {                         
        instructionExecuted = true;
        //do stuff
    } else {
        //do stuff
    }

    // Instruction 2
    if(condition && !instructionExecuted) {  // If we've not done an instruction,
                                             // and we can do instruction #2
        instructionExecuted = true;
        //do stuff
    } else if (!instructionExecuted) {       // only do this if we haven't already
                                             // done an instruction
        //do stuff
    }

    // Instruction 3
    if(condition && !instructionExecuted) { // If we've not done an instruction,
        instructionExecuted = true;         // and we can do instruction #3
        //do stuff
    } else if (!instructionExecuted) {      // only do this if we haven't already
                                            // done an instruction
        //do stuff
    }

    //etc.

    if(none condition)
    {
        break;
    }
}

Upvotes: 2

Andrew
Andrew

Reputation: 9

boolean reachable = false;
while(true){
    if(condition){ // Instruction 1
        do stuff
        reachable = true
    }else{
        do stuff
    }
    if(condition){ // Instruction 2
        do stuff
        reachable = true
    }else{
        do stuff
    }
    if(condition){ // Instruction 3
        do stuff
        reachable = true
    }else{
        do stuff
    }

    if(condition){ // Instruction 4
        do stuff
        reachable = true
    }else{
        do stuff
    }

    if(!reachable){
        break;
    }
}

Upvotes: 0

khachik
khachik

Reputation: 28703

well, there are multiple ways to accomplish what you want:

  • Introduce a top-level boolean flag doNotBreak and set true in if/else blocks execution of which means the loop should not break.
  • Check should it break or not by combining conditions using in the loop: if(condition1 && !condition2 && ..) break;
  • Instead of the last condition, break with condition and inside if/else block where you don't want to break, use continue.

Upvotes: 0

Nerdy
Nerdy

Reputation: 192

You're making this harder than it has to be. All you need to do is have an if statement with multiple else if statements after it.

Example:

if (condition) {
    doStuff();
} else if (condition) {
    doStuff();
} else if (condition) {
    ...
} else {
    break;
}

Upvotes: 0

techkris
techkris

Reputation: 5

Adding a bool trigger might be what you are looking for. if you enter any if statements turn the trigger to true.

Upvotes: 0

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