Java Process Control Statements

1.1 If statement:

The IF statement refers to some sort of processing if a certain condition is met.

1  Public classIfdemo {2      Public Static voidMain (string[] args) {3         intx = 5;4         if(X < 10) {5X + +;6         }7 System.out.println (x);8     }9}

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1.2 If ... Else statement:

A if...else statement is a process that is performed if a certain condition is met, otherwise it is handled in another way. For example, to determine the parity of a positive integer, if the number can be divisible by 2 is an even number, otherwise the figure is an odd. the specific syntax format for the IF...ELSE statement is as follows:

1  Public classifelsedemo{2      Public Static voidMain (string[] args) {3          inti = 16 ;4          //Judging variable, is odd even, divided by 2, see remainder 0 15          if(i% 2 = = 0 ){6System.out.println (i+ "is even");7}Else{8System.out.println (i+ "is odd");9          }Ten     } One}

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1.3 If ... else if ... .. Else statement:

The If...else if...else statement is used to judge multiple conditions and perform many different kinds of processing. For example, the grading of a student's test scores, if the score is greater than the grade of the superior, otherwise, if the score is greater than the grade of good , otherwise, if the score is greater than 60 grade is in, otherwise, the rating is poor. the specific syntax format for the if... else if...else statement is as follows:

1 /*2 if else if Else statement3 suitable for the realization of multi-condition judgment in the program4 Writing format:5 if (condition) {6 If execution body7 }else if (condition) {8 If execution body9 }else if (condition) {Ten If execution body One }else{ A else's execution body -      } - If the condition in the if is true, the If execution body the if the condition is false, execute the else execution body - A statement that contains multiple if, as long as there are 1 if the condition is true, the other code is not executing - */ -  Public classifelseifdemo{ +      Public Static voidMain (string[] args) { -         //The result judgment request, the result >80 the result >70 the result >60 inferior lattice +         //define variables, save scores A         intGrade = 75; at         //use if ELSE if statement to judge scores -         if(Grade > 80 ){ -System.out.println (grade+ "score is excellent"); -}Else if(Grade > 70){ -System.out.println (grade+ "score is good"); -}Else if(Grade > 60){ inSystem.out.println (grade+ "score is in"); -}Else{ toSystem.out.println (grade+ "score is poor"); +         } -     } the}

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1.4 selection Structure If statement and ternary operation transformation

The ternary operator, similar to the If-else statement, has the following syntax:

1 judging conditions? Expression 1: Expression 2

The ternary operator gets a result that is usually used to assign a variable, and when the condition is determined, the result of the operation is the value of expression 1, otherwise the result is the value of expression 2

1 /*2 Replace if statement and ternary operator3 Requirement: Already known two number, calculate maximum value4 two integers, compare size5    6 use if or ternary7 Judging conditions are many, using if8 ternary, must have the result, if can have no result9 */Ten  Public classifelsedemo_1{ One      Public Static voidMain (string[] args) { A         inti = 15; -         intj = 6; -         //use the IF statement to determine the maximum value the         if(i>j) { -System.out.println (i+ "is the maximum value"); -}Else{ -System.out.println (j+ "is the maximum value"); +         } -          +         //using ternary arithmetic to implement A         intK = i>j?i:j; atSystem.out.println (k + "is the maximum value"); -     } -}

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Java Process Control Statements